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
This is the reason ______ an airplane can't fly in space.
A．why
B．which
C．for that
单项选择题
Mary ______ that piece of cake for twenty Yuan.
A．spent
B．cost
C．bought
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