题目内容
4. By the time we arrived at the airport,the plane.
A. took off
B. have taken off
C. had taken off
D. will take off
4. C
4. C解析:by the time引导时间状语从 句,从句是一般过去时,主句要用过去完 成时。
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题目内容
4. By the time we arrived at the airport,the plane.
A. took off
B. have taken off
C. had taken off
D. will take off
4. C解析:by the time引导时间状语从 句,从句是一般过去时,主句要用过去完 成时。