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

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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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