单项选择题

The TV set is very nice. How long have you ______ it

A．bought
B．had
C．taken
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单项选择题
He is badly ill. We must ______ a doctor at once.
A．send to
B．send for
C．send away
单项选择题
We don't understand the passage ______ there are a few new words in it.
A．and
B．unless
C．because
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