By the time he was 14, Mozart many pieces of music for violin, piano and for orchestra.

A. has composed B. had composed

C. composes D. composed

B

【解析】

試題分析：考查過去完成時用法。By the time到...為止，引導(dǎo)時間狀語從句時，如果從句時態(tài)為一般過去時，主句用過去完成時；如果從句時態(tài)為一般現(xiàn)在時，主句用現(xiàn)在完成時。句意：到他14歲的時候，莫扎特已經(jīng)為小提琴，鋼琴和管弦樂創(chuàng)造了很多作品。故選B

考點：考查過去完成時用法。

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