单项选择题
It is the third time that I ______ here.
A．was
B．am
C．have been
D．had been
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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
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