单项选择题


A．about
B．at
C．to
D．in
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单项选择题
A．on thatB．on whichC．about whichD．with which
A．on that
B．on which
C．about which
D．with which
单项选择题
A．slideB．slipC．staggerD．climb
A．slide
B．slip
C．stagger
D．climb
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