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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
When I got there, the bins ____________ emptied.
A. had already been
B. had already
C. has already been
D. were already
When I got there, the bins ____________ emptied.
A. had already been
B. had already
C. has already been
D. were already
Thì quá khứ hoàn thành được dùng để diễn tả sự việc đã xảy ra trước sự việc khác (quá khứ đơn)
Đáp án A.