单项选择题

We visited the room（）they used as their lab last semester.

A．which
B．in that
C．where
D．in which

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单项选择题
He has worked very hard（）he entered the factory.

A．when
B．till
C．while
D．since
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
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