单项选择题

______ you return those books you have borrowed to the library immediately you will have to pay a fine.

A．Until
B．Provided
C．If
D．Unless
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单项选择题
He said that he would write to us but so far we ______ from him.
A．didn't hear
B．haven't heard
C．should not hear
D．hadn't heard.
单项选择题
With the help of science and technology, the farmers produced ______ crops in 1994o as the year before.
A．as twice as many
B．as twice many
C．as many as twice
D．'twice as many
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