单项选择题

"If we fail to act now, "said Tom, "We'll find ourselves ______ in action later on."

A．paid back
B．paid for
C．paid up
D．paid off
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单项选择题
That fellow ______ at long distance running.
A．excels
B．exceeds
C．surpasses
D．overtakes
单项选择题
You ______ that letter to James. However, you didn't.
A．ought to write
B．ought to have written
C．should write
D．should be writing
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