单项选择题

The scientists have made an ______study of the viruses that cause the disease.

A. exhausted
B. exhausting
C. exhaustive
D. exhaustion
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单项选择题
The company ______ a rise in salary for ages, but nothing has happened yet.
A. is promised
B. has been promising

C. is promising
D. promised
单项选择题
They______ us willingly but that they happened to be short of hands, too.
A. would help
B. would have helped
C. were going to help
D. must have helped
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