单项选择题

If it ______ rain tomorrow , we'll have the party outside.

A．wouldn't
B．didn't
C．doesn't
D．won't
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单项选择题
There were no tickets ______ for Sunday's performance.
A．possible
B．probable
C．available
D．feasible
单项选择题
But from the start of their experiments, the Wright brothers found that they needed money to pay _______ their research.
A．back
B．down
C．for
D．off
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