题目内容：

1、You can go to the party with us if you _____.
A want to B want to do C want it D want to go
为什么不用BD?
2、You ought to have called him yesterday.
Yes,I know I ______
A ought to B should have
为什么不用A?与第一题相比第一题省略了go这个动词,第二题没有省略have.到底什么时候省什么时候不省?

优质解答

1是考察不定式`~B肯定不行啦`~do后面差成分~D也差成分~want to go to the party 就可以~但不定式可以省略后面的~
2考察的是虚拟语气~have不能省的~
考点不一样啊`~