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

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

D

【解析】

試題分析：考查連詞辨析。 When：當(dāng)、、、的時(shí)候；before：在、、、之前；after：在、、、之后；since：此后，從那時(shí)到現(xiàn)在。句意：據(jù)報(bào)道，清華大學(xué)從成立至今已經(jīng)有100年了。

故選D

考點(diǎn)：考查連詞辨析

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