题目内容：

7.The most important thing______we should pay attention to is the first thing_____I’ve said.
A which;that B that;which C what;that D that;that

优质解答

D
定语从句中当先行词是序数词、形容词最高级或先行词被序数词或形容词最高级修饰时,只能用that做连接词,前半句为最高级,后半句为序数词,所以选D