The number of books in the bookshop is about 10,000 and a number of themabout science.A. i

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A. is
B. was
(答案→)C. are
D. Were
解析：考查动词的用法。依据第一句中的谓语动词“is（一般现在时）”可推断出第二句的时态也应是一般现在时，故保留A和C项；由短语“a number of...”的谓语动词是复数，故选C。