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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