单项选择题

A．that
B．which
C．what
D．if
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单项选择题
A．sitB．satC．seatingD．seated
A．sit
B．sat
C．seating
D．seated
单项选择题
A．will beB．should have beenC．might have beenD．would be
A．will be
B．should have been
C．might have been
D．would be
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