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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With the help of science and technology, the farmers produced ______ crops in 1994o as the year before.
A．as twice as many
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The teacher, as well as a number of students, ______ asked to attend the party.
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