问题 选择题

He is one of the world-famous musicians. By the time he was six, he ______ composing.

A.had begun

B.begins

C.would begin

D.was beginning

答案

答案:A

题目分析:考查谓语动词的时态 by +过去时间,谓语动词(主句)常用过去完成时态;by+将来时间,谓语动词(主句)常用将来完成时态

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