单项选择题

How long ______ each other when they got married

A．had they known
B．have they known
C．would they know
D．did they know

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单项选择题

I wouldn't get so angry if you ______ more work done.

A．get
B．got
C．will get
D．would get

单项选择题

Many teakettles whistle when the ______ starts to boil.

A．containing water inside
B．water contained inside
C．water containing inside
D．contain water

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