As it reported, it is 100 years _____________ Tsinghua University was founded.

A．when B．before C．a(chǎn)fter D．since 

D

解析試題分析:句意:根據(jù)報(bào)道，清華大學(xué)已經(jīng)建校100年了。句中采用了since在現(xiàn)在完成時(shí)當(dāng)中的一個(gè)固定結(jié)構(gòu)，即It is+時(shí)間段+since+從句（從句需要用一般過去時(shí)）。
考點(diǎn): 連詞的用法。

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