问题

I know one of the things I was unsure about was _____hard it would be to climb this mountain.

A:what
B:that
C:however
D:how

正确答案是：

同类题型

There isn’t ______ in the classroom. Let’s turn off the lights.

Will you go and see the movie NetMother with me—Thank you. But I _____it already.

He never does some sports, it is time for him ________now.

Lin Tao, do you want to visit the Great Wall, —Sure, Wen Wei wants to.

I have three sisters. They are all .