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】.
Both his parents look sad ,Maybe they ___what is happened to him ,A Knew B have known
Both his parents look sad ,Maybe they ___what is happened to him ,A Knew B have known
英语人气：671 ℃时间：2019-08-22 15:05:20
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