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—Do you know that the number of the books in this library_________about 700,000? —Yes. And I know a ...
题目内容：
—Do you know that the number of the books in this library_________about 700,000?
—Yes. And I know a large number of them_________about science and technology.
A.was;are B.was;is C.were; is D.were;are
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