单项选择题

She came into the room while they ______ television.

A．have watched
B．have been watching
C．were watching

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单项选择题

Now, Wei Fen ______ Class 3 was running very fast.

A．from
B．of
C．at

单项选择题

Don't worry , the children are now old enough to ______ themselves.

A．look round
B．look after
C．look for

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