The coronavirus had already overwhelmed China, South Korean, Iran, Italy,.....?'

A. Hadn't it

B. Hasn't it

C. Didn't it

D. Wasn't it

Buses and subways in Seoul, the normally crowded South Korean capital, were unusually quiet on Monday, and social media was (1) ................ with posts with the hashtag “work from home.” South Koreans work some of the longest hours in the world, and companies tend to disapprove of allowing employees to (2) ............... - work from home, making use of the internet, email and phone
This drastic departure from the conventions of corporate culture are a sign of how the country is fighting to slow the (3) .............. of the novel coronavirus.
For the past several days the country’s public health authorities have reported drastic increases (4)........ the number of cases here, with 231 new cases on Monday, bringing the total number to 900, with more than 11,600 people undergoing diagnostic testing. 9 South Koreans infected with the virus, called COVID-19, have died. The (5) ...........of 51 million people now has the highest number of coronavirus cases outside mainland China

It was not until ... that ..., sau "that" nhớ bỏ (didn't) nhưng các trường hợp (couldn't/ weren't/ wasn't/ hadn't) sau that chỉ bỏ "not" mà thôi.

43. The little girl didn't open the gifts until the last visitor left.

-> It ..............................................................................................

44. He didn't get married until he was forty.

-> It .........................................................................................

45. He hadn't been a famous singer before he went to HCM city.

-> It ..........................................................................................

46. She didn't begin to learn English until 1980.

-> It ...........................................................................................

Bài tập: Chọn đáp án có ý nghĩa giống với câu gốc

1. I had already seen the film but I decided to watch it again last night.

a.I watched the film last night for the first time 

b.Last night wasn't the first time that I had seen the film

2The boys were playing football while it was raining 

a. the boys were playing football until it started to rain

b. the boys played football in the rain.

3.I was writingan email when our computer broke down

a.our computer broke down before I wrote an email

b. I had stared writing an email and then our computer broke down

4.My aunt bought me a lovely gift after she had spent the summer holiday with us 

a.when the summer holiday was over,my aunt bought me a lovely gift

b.while my aunt was spending the summer holiday with us,she bought us a lovely gift