He (not be) _________ to Vietnam before last year.
A. not been
B. had been not
C. didn’t have been
D. hadn’t been
Ta thấy có “before + thời gian trong quá khứ” cho biết mệnh đề phía trước “before” diễn tả một sự việc xảy ra trước một thời điểm trong quá khứ nên ta sử dụng thì quá khứ hoàn thành
Cấu trúc: S+ had (not) + VpII.
=>He hadn't been to Vietnam before last year.
Tạm dịch: Anh ấy chưa từng tới Việt Nam trước thời điểm năm ngoái.
Đáp án cần chọn là: D
Frank Sinatra caught the flu because he (sing)__________ in the rain too long.
How long (learn / she)_________ English before she went to London?
He (drive) __________less than an hour when he ran out of petrol.
One of the parents _____________ the children's song this time last year.
I ______ my document before the power went out in the computer lab.
As soon as I shut the front door I realised that I………….my key in the house.
Marry _________ her housework already by the time Peter came over.
The doctor took off the plaster that he (put on)_________ six weeks before.