______, Mozart had already written his first composition.

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问题 ______, Mozart had already written his first composition.

选项 A、His age was six
B、By the age of six
C、He was six
D、Six years old

答案B

解析逗号前面为时间状语。此处只能用介词短语习惯表达法。A和C选项缺少时间连词When；D选项用法错误。

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GCT工程硕士（英语）

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