单项选择题

A．which
B．that
C．as
D．when
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单项选择题
A．failing makingB．failing and makingC．failing to makeD．failing to making
A．failing making
B．failing and making
C．failing to make
D．failing to making
单项选择题
A．classB．kindC．sortD．type
A．class
B．kind
C．sort
D．type
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