单项选择题

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

A．needn't have done
B．must not have done
C．shouldn't have done
D．can not have done
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单项选择题
What’s the meaning of prepare in Line 2, Para. 2
A．To make ready.
B．To make fit.
C．To make in a special way.
D．To make accustomed.
单项选择题
Go straight into the cave and find out what's in there, ______
A．don't you
B．do you
C．will you
D．can you
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