单项选择题

There is __________ "O" and __________ "U" in the word "hour".

A．a...a
B．a...an
C．an...a
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单项选择题
The doctor said to him, Just a cold __________
A．Anything serious
B．Nothing serious
C．Serious nothing
单项选择题
He is __________ tired that he can't walk any further.
A．very
B．too
C．so
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