单项选择题

This platform would collapse if all of us ______ on it.

A．stand
B．stood
C．would stand
D．had stood
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单项选择题
In his ______ to further knowledge of the universe, man has now begun to explore space.
A．attempt
B．expedition
C．trial
D．chase
单项选择题
The senator agrees that his support of the action would ______ his chances for reelection.
A．obscure
B．mystify
C．distinguish
D．jeopardize
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