英语三级B级
A．won' t have known
B．can' t have known
C．shouldn' t know
D．mustn' t know
【考点】情态动词的用法
【解析】情态动词can/must+have done表示对已经发生的事物的一种推测，can 表示推测(惊讶、怀疑、不相信的态度)时，用于疑问句、否定句和感叹句中；must表示推测时，只用于肯定的陈述句中，故选B。
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