It is reported that it is 100 years Qinghua University was founded.A. when B. before C. a

问题补充：

It is reported that it is 100 years Qinghua University was founded.

A. when

B. before

C. after

D. since

答案：

A. when

B. before

C. after

(答案→)D. since

解析：考查固定句式。It is 一段时间 since…自从…以来有…长时间。句意：只从清华大学成立以来已经100多年了。AB项的意义与 句意不相符。故D正确。

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