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
【正确答案】
B
【答案解析】
[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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