By the time you arrive in London,we __in Europe for two weeks.

题目

By the time you arrive in London,we __in Europe for two weeks.
A.shall stay B.will have stayed C.have stayed D.have been staying

答案

B.By the time 相当与连词,引导的从句用一般的时态

主句用完成时,(从句用一般过去时,主句就用过去完成时;从句用一般现在

时,主句就用现在完成时)