单项选择题

When we got there, what were left behind __ empty bottles.

A．had been
B．are
C．were
D．was
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单项选择题
The policeman declared that the blow on the victim's head ______ from behind.
A．should have been made
B．must have been made
C．would have been made
D．ought to have been made
单项选择题
You cannot be ______ careful when you drive a car.
A．very
B．so
C．too
D．enough
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