单项选择题

A) How C) Whether
B) Why D) When

A．How
B．Why
C．Whether
D．When
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单项选择题
A) at C) with B) to D) for
A．at
B．to
C．with
D．for
单项选择题
A) in which C) to which B) at which D) for which
A．in which
B．at which
C．to which
D．for which
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