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

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

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

试题答案

A

解析试题