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
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(答案→)A. are；are
B. is；is
C. are；is
D. is：are
解析：考查主谓一致。Such位于句首时，应该用倒装。由poets可知，谓语用复数；works“作品”，是可数名词，谓语也要用复数。故选A。