摘要:--Where's Mary? --Oh,she the library. A.has gone to B.went to C.has been to D.had gone to H:过去完成时棗表示过去某一时间或动作之前已完成的动作 结构: 助动词had + 动词的过去分词 用法: 1.表示在过去某一时间或动作之前已经发生或完成了的动作,动作发生的时间为“过去的过去“.表示过去某一时间可用by,before 等构成的短语,也可用when,before等引导的从句或通过上下文表示. eg. By the end of last term,we had learned a thousand English words. He had finished his homework before his father came back last night.

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