解题思路: 本题较难,what引导表语从句,what在从句中作主语、宾语或表语;that也可引导表语从句,但不作成分,不能省略且无词义. ①Is this what you want to tell me?(what引导表语从句,同时又作tell的宾语) ②The problem is that we have not enough money to buy the expensive car.(that引导表语从句,但不作成分)"
解题过程:
14.选A。what引导了一个表语从句,作is的表语。when引导了一个非限制性定语从句,用以说明这所学校20年前的样子。