单项选择题

You ______ all those calculations ! We have a computer to do that sort of things.

A. needn’t have done
B. shouldn’t have done

C. must not have done
D. could not have done
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单项选择题
A. In a bank. B. At a restaurant.C. In a post office. D. In a library.
A. In a bank.
B. At a restaurant.
C. In a post office.
D. In a library.
单项选择题
A) 3 hours. C) 5 years old. B) 4 dollars. D) 2 minutes ago.
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