By the time John arrived, all his friends _____________. A. have left            B. would leave       C. had left              D. were leaving

Mark the letter A, B, C, or D to indicate the most suitable answer to each of the following questions.

By the time John arrived, all his friends _____________.

A. have left           
B. would leave
C. had left    
D. were leaving

Trả lời

Chọn đáp án C

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