— Who do you think the book here? — It may be John. He was sitting here all the morning.A

问题补充：

— Who do you think the book here?

— It may be John. He was sitting here all the morning.

A. was leaving

B. leaves

C. had left

D. has left

答案：

A. was leaving

B. leaves

C. had left

(答案→)D. has left

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