All the residents were evacuated to a safe place, and then the building collapsed. * A. After all the residents were evacuate

All the residents were evacuated to a safe place, and then the building collapsed. *
A. After all the residents were evacuated to a safe place, the building collapsed.
B. After all the residents were evacuated to a safe place, the building had collapsed.
C. After all the residents had been evacuated to a safe place, the building collapsed.
D. After all the residents had been evacuated to a safe place, the building had collapsed.

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  1. Giải đáp: C
    Để nói về sự việc này diễn ra trước hoặc sau sự việc kia trong quá khứ ta dùng thì quá khứ hoàn thành. Sự việc nào diễn ra trước chia thì quá khứ hoàn thành, sự việc nào diễn ra sau chia thì quá đơn
    Cấu trúc câu bị động thì quá khứ hoàn thành:
    text{S+had been+V3/Ved+(by O)+…}

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