It ____ that all the students were having lessons in the teaching buildings when the earthquake occurred.

A. happens B. was happened

C. was happening D. happened

D

【解析】

試題分析:考查時態(tài)。句意:當?shù)卣鸢l(fā)生時,所有的學(xué)生碰巧正在教學(xué)樓里上課。It happened/happens that...碰巧發(fā)生某事,根據(jù)句意可知是過去的事情,用happened,故選D。

考點:考查時態(tài)

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