单项选择题


A．flip on
B．flap at
C．fling away
D．flush out
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单项选择题
A．whichB．whatC．howD．whether
A．which
B．what
C．how
D．whether
单项选择题
A．work inB．work outC．work overD．work off
A．work in
B．work out
C．work over
D．work off
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