单项选择题
A．in
B．by
C．at
D．for
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单项选择题
A．fallB．helpC．manageD．stop
A．fall
B．help
C．manage
D．stop
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单项选择题
A．relativeB．intelligentlyC．regularlyD．environmentally
A．relative
B．intelligently
C．regularly
D．environmentally
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