单项选择题

Tom has been in the factory ______ he left school.

A．when
B．as soon as
C．since
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The room is too small, there's no enough ______ for another desk.
A．place
B．room
C．floor
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Let's look at the bag. Can you see ______ x on the comer of ______bag.
A．a, a
B．a, the
C．an, the
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