单项选择题


A．to do
B．doing
C．at doing
D．with doing
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单项选择题
A．untilB．afterC．whileD．so
A．until
B．after
C．while
D．so
单项选择题
A．three week's workB．three weeks' worksC．three weeks' workD．three week's works
A．three week's work
B．three weeks' works
C．three weeks' work
D．three week's works
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