单项选择题

We must run, otherwise we will be late.

A．but
B．if not
C．when
D．unless
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单项选择题
We must increase our output to meet the demand of the market.
A．profit
B．export
C．interest
D．production
单项选择题
They had put up with behavior from their son which they would not have tolerated from anyone else.
A．accepted
B．suffered
C．endured
D．received
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