As is reported it is 100 yearsQinghua University was founded.A. when 　B. beforeC. afterD.

问题补充：

As is reported, it is 100 yearsQinghua 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。固定句式：it has been/is 一段时间 since…自从…以来已经有…时间。句意：正如报告一样，清华大学成立已经有100多年的历史了。故D正确。本题AB两项也是考查较多的内容。