单项选择题

We have produced twice as much steel this year（）4 years ago.

A. than we did
B. as we did
C. than we have produced
D. as we have produced

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Under no circumstances（）leave his post.

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B. a solider must
C. mustn't a soldier
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The experience（）in the war will be of great value to us.

A. to gain
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