单项选择题

I would have come sooner but I（）that you were waiting for me.

A．didn't know
B．don't know
C．hadn't know
D．haven't known

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单项选择题
When Jack arrived, he learned Mary（）for almost an hour.

A．had gone
B．had set off
C．had left
D．had been away
单项选择题
After the new technique was introduced, the factory produced（）tractors in 1998 than the year before.

A．as twice many
B．as many twice
C．twice as many
D．twice many as
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