Both his parents look sad.Maybe they ________ what's happened to him.

[  ]

A.

knew

B.

have known

C.

must know

D.

will know

答案:B
解析:

  現(xiàn)在完成時(shí)主要強(qiáng)調(diào)過(guò)去發(fā)生的動(dòng)作對(duì)現(xiàn)在造成的影響,或過(guò)去發(fā)生的動(dòng)作還未結(jié)束,一直持續(xù)到現(xiàn)在或?qū)?lái)。根據(jù)上下文分析、推理,正確答案是B。


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