Choose the best answer.
While we ................................. in the park, Mary fell over.
-
A.
ran
-
B.
are running
-
C.
was running
-
D.
were running
2 hành động xảy ra trong quá khứ: 1 hành động đang diễn ra (chia quá khứ tiếp diễn) thì có 1 hành động khác xen ngang (chia quá khứ đơn).
Cấu trúc phối hợp thì giữa 2 hành động: When/ While + S + V-ed/V cột 2, S + was/were + V-ing
=> While we were running in the park, Mary fell over.
Tạm dịch: Khi chúng tôi đang chạy trong công viên, Mary bị ngã.
Đáp án : D
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