单项选择题

He has worked very hard（）he entered the factory.

A．when
B．till
C．while
D．since

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单项选择题
It's high time someone（）Mike that each member of a team has to do his share of work.

A．could tell
B．tell
C．told
D．would tell
单项选择题
It would be better to mail a letter of application to his advertiser（）to call him.

A．rather than
B．so as
C．as well
D．or else
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