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.

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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
单项选择题
（）you were coming today, I would have picked you up at the station.

A．Had I known
B．I have known
C．Have I known
D．I had known
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