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    【题目】Lisa had travelled to three different countries by herself ________ the age of 20.

    A.byB.atC.inD.since

    【答案】A

    【解析】

    句意：丽莎到20岁时已经独自一人到过三个不同的国家。

    考查介词辨析。by不迟于；在……之前；at在 (某时间或时刻) ；in在 (某范围或空间内的) 某一点；since自……以来。at the age of 20=in one’s 20 years of age在某人20岁时，因此选项C不对；at the age of的时态为：一般过去时、过去进行时；由since引导的时间状语从句的时态为现在完成时；由本题的had travelled可知，本题是过去完成时，因此排除选项B/D；by the age of截止到……年龄；其时态为：过去完成时。故选A。

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