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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单项选择题
Mary ______ that piece of cake for twenty Yuan.
A．spent
B．cost
C．bought
单项选择题
I didn't know ______ at the meeting yesterday.
A．what to say
B．to say what
C．why to say
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