单项选择题

Animals can only survive ______ the living environment is similar to the earth.

A．which
B．whose
C．what
D．where
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单项选择题
You ______ the manager anything. It was none of his business.
A．needn't have told
B．needn't tell
C．mustn't have told
D．mustn't tell
单项选择题
______ travel round the world alone shows that he is full of courage.
A．His deciding of
B．He decides
C．His decide
D．His deciding to
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