题目内容
As it reported, it is 100 years _____________ Tsinghua University was founded.
A.when | B.before | C.after | D.since |
D
解析试题分析:句意:根据报道,清华大学已经建校100年了。句中采用了since在现在完成时当中的一个固定结构,即It is+时间段+since+从句(从句需要用一般过去时)。
考点: 连词的用法。

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