单项选择题

If motorists had to pay an extra tax to drive in cities, they （） their cars a lot less.

A. use
B. will use
C. used
D. would use

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单项选择题
John’s completely unaware how much damage he did the company, （）

A. didn’t he
B. did he
C. isn’t he
D. is he
单项选择题
（） a binding contract last year and it is still valid.

A. We have signed
B. We haven’t signed
C. We signed
D. We had signed
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