问题

His coming adds to the difficulty we ____ the problem

A:have to solve
B:have solve
C:have solved
D:have solving

正确答案是：

同类题型

homework ,the children also have to take arts, music and sports classes intheir free time.— I wonder what they will become.

Books of this kindwell.

Do you have _______ to say today—No, nothing.

eem not to be today,Jane What’s up—inparticular; only a little headache

I think our government should pass a law to food waste.