单项选择题

A．Because
B．Though
C．Whether
D．If
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单项选择题
A．in thatB．for whichC．with whomD．such as
A．in that
B．for which
C．with whom
D．such as
单项选择题
A．preventB．requireC．assistD．forbid
A．prevent
B．require
C．assist
D．forbid
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