单项选择题


A．which
B．what
C．how
D．whether
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单项选择题
A．commit themselves toB．commit themselves onC．commute themselves toD．comply themselves to
A．commit themselves to
B．commit themselves on
C．commute themselves to
D．comply themselves to
单项选择题
A．flip onB．flap atC．fling awayD．flush out
A．flip on
B．flap at
C．fling away
D．flush out
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