单项选择题


A．on that
B．on which
C．at that
D．at which
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单项选择题
A．whichB．whatC．thatD．
A．which
B．what
C．that
D．/
单项选择题
A．in the event ofB．in the case ofC．with a view toD．with reference to
A．in the event of
B．in the case of
C．with a view to
D．with reference to
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