－How many workers are there in your factory?－ the workers in my factory over two thousand

－How many workers are there in your factory?
－ the workers in my factory over two thousand .
A. The number of , is
B. The number of , are
C. A number of, is
D. A number of , are

(答案→)A. The number of , isB. The number of , areC. A number of, isD. A number of , are解析：表示···的数量用the number of，且作为主语时，相当于单数形式，故选答案为A

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