The floor ________ when I arrived
A. has been cleaned
B. is being cleaned
C. was cleaned
D. was being cleaned
Trong câu cần sử dụng sự hòa hợp giữa 2 thì là quá khứ đơn và quá khứ tiếp diễn để diễn tả hành động đang diễn ra trong quá khứ thì có 1 hành động khác chen ngang.
=> “Someone” was cleaning the floor when I arrived.
=> The floor was being cleaned when I arrived.
Tạm dịch: Khi tôi đến thì sàn nhà đang được lau.
Đáp án cần chọn là: D
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