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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It's no good（）problems with a man like him.

A. to discuss
B. being discussed
C. discussing
D. to be discussed
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Not only I but also Jane and Mary（）tired of having one exam after another.

A. is
B. are
C. am
D. be
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