单项选择题

If tap water were as dangerous as some people think, ______ would be getting sick.

A．a lot of more us
B．more a lot of us
C．a lot of us more
D．a lot more of us
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单项选择题
It was very kind of you to do the washing-up, but you ______it.
A．mustn't have done
B．wouldn't have done
C．mightn't have done
D．didn't have to do
单项选择题
They are going to have the serviceman ______ an electric fan in the office tomorrow.
A．install
B．to install
C．to be installed
D．installed
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