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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单项选择题
______ there is little we can do to modify the weather, we can at least know what kind of weather to expect.
A．Since
B．When
C．While
D．Unless
单项选择题
That fellow ______ at long distance running.
A．excels
B．exceeds
C．surpasses
D．overtakes
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