单项选择题

It is necessary that everyone ______ a copy of this book.

A．has
B．could have
C．will have
D．should have
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单项选择题
— My God! I have to walk home now, for I just missed the bus. —That's too bad. You ______ it, had you set out a bit earlier.
A．should have caught
B．had caught
C．would have caught
D．could catch
单项选择题
You should learn to take ______ of every opportunity to improve your oral English.
A．chance
B．use
C．action
D．advantage
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