By the time he arrives in Tianjing we here for two days.A. have stayedB. have been stayi

问题补充：

By the time he arrives in Tianjing, we here for two days.

A. have stayed

B. have been staying

C. stay

D. will have stayed

答案：

A. have stayed

B. have been staying

C. stay

(答案→)D. will have stayed

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