题目内容：

He is working hard and ______ will make him pass the final exam.A which B for which C it D that
每个选项最好都说一下,说得让人明白一点

优质解答

A 不对,which做定语从句,前面不能加and连词
B不对,语法,意思都不对
C it不能代替前面的内容
D that 代填前面内容