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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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
The theory is of great importance _______ the hotter a boby is, the more energy it radiates.
A．that
B．when
C．which
D．what
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