—What made her so happy?
1个回答

A

考查从句。句意:什么使她如此高兴?她儿子通过了驾驶考试让她如此高兴。_____ her son passed the driving test补充完整是_____ her son passed the driving test made her so happy。所以_____ her son passed the driving test是主语从句,且从句句意完整,用That引导,B,C不能引导主从,而D只能做状语。