问题

So difficult____it to acquire a large vocabulary without the help of a teacher that he was close to giving up .

A:he have felt
B:have he felt
C:he did feel
D:did he feel

正确答案是：

同类题型

_________ where the sound lab _________?

The secretary________letters all the afternoon and there are still two letters to finish. [ ]

We have a lot of homework______. We are very busy today.

I will watch TV rather than thisfilm.

Where is Mr. Wu I haven’t seen him for several days.—He ________ America and he ________ from his home since last week.