是How to answer还是What to answerHe doesn't know () to answer

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是Howtoanswer还是WhattoanswerHedoesn''tknow()toanswer是Howtoanswer还是WhattoanswerHedoesn''tknow()toanswer是H

是How to answer还是What to answerHe doesn't know () to answer
是How to answer还是What to answer
He doesn't know () to answer

是How to answer还是What to answerHe doesn't know () to answer
楼上的错了哦,应该用what
如果用how的话,从句 how to answer 缺宾语,
故,用how ,应表达为He doesn't know how to answer it
而what 本身是可以当宾语的,故可以直接用what to answer.

what to anser
如何回答。
He doesn't know (what) to answer
依然是 what
希望帮到你,望采纳,谢谢。

what
answer是及物动词 必须用what当作宾语
how to answer it才行 how是副词

用what.
跟what to do & how to do it一样理解;
how是绝对错误的!