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

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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
单项选择题
If I （） get back to London in time, I’ll definitely come.

A. can
B. could
C. would be able to
D. will be able to
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