专四

单选题I could never understand __________.

A. why did Jane do such a crazy thing
B. why Jane does such a crazy thing
C. why Jane has done such a crazy thing
D. why Jane did such a crazy thing

参考答案:D进入在线模考
译文:我不能理解,简为什么会做出这么疯狂的事。
宾语从句题。understand后边接的是宾语从句,宾语从句中要用陈述句语序,主句动词是一般过去时,宾语从句也应该使用过去时态,因此答案为[D]。