A number of books been stolen from the library since the beginning of this term and the n

问题补充：

A number of books been stolen from the library since the beginning of this term and the number as large as 500.

A. have; are

B. has; is

C. has; are

D. have; is

答案：

A. have; are

B. has; is

C. has; are

(答案→)D. have; is

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