题目

Such poets as Shakespeare ________ widely read, of whose works, however, some             difficult to understand.（  ）   A. are; are    B. is; is     C. are; is      D. is; are   答案： A   主句中的主语应为poets,谓语动词用复数，其后的非限制性定语从句的主语应为some of whose works，谓语动词也应是复数。故选A。  

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