题目内容

When he came in, we the problem.

A. were discussing
B. discussed
C. had discussed
D. have been discussed

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She ought to stop work; she has a headache because she ______ too long. (2000.1. CET-4)

A. has been reading
B. had read
C. is reading
D. read

Many kinds of wilds animals ______ from the earth.

A. being disappearing
B. being disappeared
C. are disappearing
D. are disappeared

The conference ______ a full week by the time it ends.

A. has lasted
B. last
C. will have lasted
D. is lasted

There was a knock at the door. It was the second time someone ______ me that evening. (1991.6. CET-6)

A. had interrupted
B. would have interrupted
C. to have interrupted to interrupted