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
We can rely on William to carry out this mission, for his judgment is always ______.
A．inexplicable
B．healthy
C．sound
D．straight
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