题目内容

As is reported，it is 100 years ________ Qinghua University was founded.

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

D

【解析】

试题分析：考查连词辨析。 When：当、、、的时候；before：在、、、之前；after：在、、、之后；since：此后，从那时到现在。句意：据报道，清华大学从成立至今已经有100年了。

故选D

考点：考查连词辨析

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