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4.Bythetimewearrivedattheairporttheplane.A.tookoffB.havetakenoffC.hadtakenoffD.willtakeoff

题目详情

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

▼优质解答
答案和解析
4. C4. 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。