单项选择题

______of the students is able to answer the question.

A. None
B. Nobody
C. No one
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单项选择题
______ trees are cut down in the forests every year.
A. Thousands
B. Thousands of
C. Thousand of
单项选择题
______ I've read this book, you can have it.
A. Though
B. Until
C. Since
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