单项选择题

A．When
B．As
C．After
D．Before
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单项选择题
A．awfulB．unsuitableC．idealD．wrong
A．awful
B．unsuitable
C．ideal
D．wrong
单项选择题
A．whichB．thatC．at whichD．at that
A．which
B．that
C．at which
D．at that
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