【单选题】 ______ , Mozart had already written his first composition.
A．His age was six
B．By the age of six
C．He was six
D．Six years old
网考网参考答案：B
网考网解析：
[注释] 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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【单选题】 ______ , Mozart had already written his first composition.
A．His age was six
B．By the age of six
C．He was six
D．Six years old
网考网参考答案：B
网考网解析：
[注释] 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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