将句子 He answered the questions in public.转换成被动语态，The questions_______ by him in public. A: are answered B: were answered C: are being answered D: were being answered

The telephone (ring) __________ for three minutes before it was answered.

This question is (difficult) _________ than the one I have answered.

The question is one of (difficult) _______ that I have ever answered.

A rhetorical question is a statement that is formulated as a question but one that is not supposed to be answered. A: 正确 B: 错误

There was a knock on the door, but _____ answered it.

If the question ____ incorrectly, _____ question will be given to you. A: is answered; other B: answers; other C: is answered; another D: answers; another

I<br/>called you, but nobody answered. Where ________you? A: is B: are C: was D: were

She ought to __________ my letter a week ago. But she was busy with her work at that time. A: have answered B: answering C: answer D: be answered

—I called you at 4:00 yesterday afternoon, but no one answered. —Sorry, I _____ with my friends at that time.