By the time he was 14, Mozart many piece...

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】试题分析：考查过去完成时用法。By the time到...为止，引导时间状语从句时，如果从句时态为一般过去时，主句用过去完成时；如果从句时态为一般现在时，主句用现在完成时。句意：到他14岁的时候，莫扎特已经为小提琴，钢琴和管弦乐创造了很多作品。故选B 考点：考查过去完成时用法。

考点分析：

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