Both his parents look sad ,Maybe they ___what is happened to him ,A Knew B have known
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Both his parents look sad ,Maybe they ___what has happened to him .
A Knew B have known
选项是B
【have known】是现在完成时，表示对现在造成的影响【look sad】。
A Knew B have known
选项是B
【have known】是现在完成时，表示对现在造成的影响【look sad】。
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