She looks sad.Could you please tell me ____ that prevents her from being as happy as before?A.what it is B.it is what C.how it is D.it is how

She looks sad.Could you please tell me ____ that prevents her from being as happy as before?
A.what it is B.it is what C.how it is D.it is how

答案A 主要测试宾语从句.只不过把宾语从句的测试放到强调句型中来测试,首先按照强调句型的判断方法：把It is···that去掉,则很容易地看出what引导的宾语从句,而且what在从句prevents her from being as happy as before中充当主语.所以选择A最佳.译文：她看起来不高兴.你能告诉我究竟是什么让她没有以前那么高兴了吗? 查看原帖>>