单项选择题

I don’t know _________ get his hair cut.

A．why Tom doesn't
B．why does Tom not
C．why Tom not
D．why doesn't Tom
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单项选择题
we would have gone sailing last week _________ nicer.
A．if the weather has been
B．would the weather be
C．if the weather would be
D．had the weather been
单项选择题
_________ the button at the right and you can turn on the TV.
A．Pushed
B．To push
C．Push
D．By pushing
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