单项选择题


A．follow
B．go
C．operate
D．work
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单项选择题
A．to doB．doingC．at doingD．with doing
A．to do
B．doing
C．at doing
D．with doing
单项选择题
A．WhicheverB．WhateverC．HoweverD．Wherever
A．Whichever
B．Whatever
C．However
D．Wherever
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