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
China is larger than______ in Asia.
A．any other country
B．other countries
C．any country
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