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    【题目】— Haven’t met Mary lately. What has happened to her?

    — Well, it’s about three months ________she worked here.

    A. before B. after C. since D. when

    【答案】C

    【解析】

    试题分析：句意：--最近没有见过玛丽。她发生了什么事情。--玛丽不在这里工作大约3个月了。A. before 之前 ；B. after 之后 ；C. since 自从 ；D. when时间点。It was+时段+before+从句（过去时），It is+时段+since+从句（过去时）根据has happened现在完成时态得知，答语中it’s是it is.故选C。

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