20. He doesn't know ______ A. when to do B. what to do C. how to do D. where to do这句话是宾语从句吗?为什么选B请详解,谢谢.

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20.Hedoesn''tknow______A.whentodoB.whattodoC.howtodoD.wheretodo这句话是宾语从句吗?为什么选B请详解,谢谢.20.Hedoesn''tknow

20. He doesn't know ______ A. when to do B. what to do C. how to do D. where to do这句话是宾语从句吗?为什么选B请详解,谢谢.
20. He doesn't know ______ A. when to do B. what to do C. how to do D. where to do
这句话是宾语从句吗?为什么选B请详解,谢谢.

20. He doesn't know ______ A. when to do B. what to do C. how to do D. where to do这句话是宾语从句吗?为什么选B请详解,谢谢.
应该是名词性从句,在这,what 表示的是什么.这句话是想说他不知道该做什么.如果选A,C or D,那么句子就会缺名词,从而使的句子不完整

非完整的宾语从句，是宾语从句的省略结构，至于选b，因为其他几个意思不通。what是do的宾语，选其他，do就没对象了，那都是状语

第一种解释是凭借语感其中when how where 都可以引导宾从但只能做状语句子缺乏宾语

英语翻译he doesn't know _____________ He doesn't know BeiJing verywell He doesn't love me,I know. He doesn't know when ____(leave) here; He doesn't know when he___(leave) here 同义句He doesn't know me.He doesn't know _______ ______ ______. He still doesn't know和Still he doesn't know的区别 He doesn't know what he will say. He doesn't know the answer t the question he doesn't know what can he wear today.同义句 . He doesn't know what 横线横线 today. He doesn't know where he can go.(同义句) He doesn't know _____ ______ ______ . he doesn't know how he can get it(改为同义句) he doesn't know how______ ______it He doesn't know how he can get it.改为同义句 He doesn't know how ( ) ( ) it. He doesn't know how he can get there?(同意句）He doesn't know ______ _______ _______ there. He doesn't know much Chinese.(同义句)5555. He doesn't know ___(该做什么). He doesn't want to l____ the other children know. he doesn't know how to do next（改错） he doesn't know the girl 改为肯定句