As it reported, it is 100 years _____________ Tsinghua University was founded.
A．whenB．beforeC．a(chǎn)fterD．since
D

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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