单项选择题

______our classroom twice a week is necessary.

A． Cleaned
B． Clean
C． To clean
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单项选择题
— Tom is working hard recent days. He ______pass his exam this time. — Yes, I think so.
A． has to
B． need
C． may
单项选择题
I like red flowers, but my sister likes white______.
A． flower
B． one
C． ones
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