单项选择题

A．at
B．for
C．by
D．until
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单项选择题
A．at whichB．whenC．thatD．during which
A．at which
B．when
C．that
D．during which
单项选择题
A．AsB．SinceC．WhileD．In spite of
A．As
B．Since
C．While
D．In spite of
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