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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He bought her what she wanted, （） the fact that they were costly.

A. even if
B. as though
C. only if
D. regardless of
单项选择题
Under no circumstances （） leave his post.

A. a soldier mustn't
B. a solider must
C. mustn't a soldier
D. must a solider
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