Choose the correct answer to each of the following questions or choose the best rewritten sentences.

Câu hỏi

“Did you get much studying done last night?” “Only for a few minutes______ when some friends turned up."

A. was I studying

B. I was studying

C. I had studied

D. had I been studying

Đáp án
D. had I been studying

Câu hỏi thuộc Bài tập:

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