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
We can rely on William to carry out this mission, for his judgment is always ______.
A．inexplicable
B．healthy
C．sound
D．straight
单项选择题
The Canadian unions tend to strive for wage parity, with their counterparts in the United States.
A．equality
B．promotion
C．criterion
D．stipulation
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