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
The elephant is _____ big that he can't get into the room.
A． so
B． such
C． very
单项选择题
This is the reason ______ an airplane can't fly in space.
A． why
B． which
C． for that
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