1. They ________ us since five o'clock this morning.

A. are helping            B. have been helping

C. have been helped       D. have helped

2. I ________ the book the whole day, yet I haven't finished it.

A. have been reading       B. have read

C. am reading             D. had been reading

3. Please come in. We ________ about your paper.

A. talk                   B. had been talking

C. have been talking        D. would have talked

4. Such natural resources as coal and petroleum ________.

A. gradually are exhausted     B. are being gradually exhausted

C. have gradually exhausting   D. have been exhausting gradually

5. It ________ almost every day so far this month.

A. is raining       B. rained        C. rains         D. has been raining

用所给动词正确时态填空。

1. You should go to bed. You ________ (watch) TV for 5 hours. joozone.com