题目内容
3. (2015 .上海宝山一模) Tom had learned more than
100 words the age of five.
A. by B about
C. at D. of
3. A
3. A解析：考查介词的用法。短语 by the age of…“到……岁时，，，用 于完成时，at the age of…用于一 般过去时，表示“在……岁时”。
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题目内容
3. (2015 .上海宝山一模) Tom had learned more than
100 words the age of five.
A. by B about
C. at D. of
3. A解析：考查介词的用法。短语 by the age of…“到……岁时，，，用 于完成时，at the age of…用于一 般过去时，表示“在……岁时”。