单项选择题

Some of his suggestions had been rejected ______ they were not practicable.

A．as
B．when
C．until
D．if
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单项选择题
If I had hurried, I ______ the plane.
A．could catch
B．would catch
C．should catch
D．would have caught
单项选择题
The new bill will come into ______ on the day it is passed.
A．effect
B．use
C．service
D．existence
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