He didn't know -------to do?应该填how还是what?why?

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Hedidn''tknow-------todo?应该填how还是what?why?Hedidn''tknow-------todo?应该填how还是what?why?Hedidn''tknow------

He didn't know -------to do?应该填how还是what?why?
He didn't know -------to do?应该填how还是what?why?

He didn't know -------to do?应该填how还是what?why?
填How的时候意为“他不知道该怎样去做某事”;若是填What的情况下意为“他不知道该做什么”,请根据句意及语境来填.

what和how都可以的
what的话,是他不知道该做什么
how的话,是他不知道该怎么做