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

It's quite early. We ______ worry about the time.

A． mustn't
B． may not
C． needn't

单项选择题

My litter sister is only five, ______ she can swim well.

A． but
B． so
C． because

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