单项选择题

Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.

A. having
B. had

C. have
D. to have

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单项选择题

Unless he ______ to help us, we shall lose the game.

A．promises

B．will promise
C．would promise

D．had promised

单项选择题

It was said that he died（）a fever.

A. in
B. by
C. of
D. from

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