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

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

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

Both his parents look sad .Maybe they ( ) what's happened to him
have known

have known

括号里要填神马

had known

have known

have done (do)
do为给出的动词原形