The doctor took off the plaster that he (put on)_________ six weeks before.
A. has put on
B. had put on
C. had been putting on
D. has been putting on
Giải bởi Vietjack
Dấu hiệu: six weeks before, The doctor took off ->hành động sau put on xảy ra trước hành động took off trong quá khứ. Như vậy, ta phải chia thì quá khứ hoàn thành với sự việc xảy ra trước.
Cấu trúc: S + had Vp2
=>The doctor took off the plaster that he had put on six weeks before.
Tạm dịch: Bác sĩ đã tháo lớp thạch cao mà anh ta đã đặt vào sáu tuần trước đó.
Đáp án cần chọn là: B
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