【題目】— 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】

試題分析：句意：--最近沒有見過瑪麗。她發(fā)生了什么事情。--瑪麗不在這里工作大約3個月了。A. before 之前 ；B. after 之后 ；C. since 自從 ；D. when時間點。It was+時段+before+從句（過去時），It is+時段+since+從句（過去時）根據(jù)has happened現(xiàn)在完成時態(tài)得知，答語中it’s是it is.故選C。

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