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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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
No book and no pen ______ in the bag.
A．is
B．are
C．has
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