The mother didn't know ________ to blame for the broken glass as it happened while she was out.
A.whatB.howC.whenD.who在线课程D
名词性从句的引导词中,what, who, how, when等词在从句中均充当成分,在从句中作主语、宾语及表语时用what,指人用who,作状语表方式、时间及地点时用how, when, where,引导词+不定式结构相当于简略式从句。需指出的是,that引导名词性从句时引导词在从句中不作任何成分,what只能引导名词性从句,不能引导定语及状语从句。
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