I don't know _______________.A.why do this B.why having done this C.why doing thisD.why we ought to do this请问,选什么,为什么呢?

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I don't know _______________.A.why do this B.why having done this C.why doing this
D.why we ought to do this
请问,选什么,为什么呢?

选D,因为其他三项没主语,
你好聪明哦,不贴出答案,防止某些人浑水摸鱼,因为这里是一个宾语从句,在从句中,除了where to do,what to do,how to do这三个结构外,其他的都必须要有主谓宾结构,你的A B C项,均却主语,所以,你明白为什么了吧

我选C我没有理由

选D， 这是个宾语从句，从句里应该是陈述句语序。

A

b

选D，第一点A.B和C，他们都没有主语，第二点，题干是句号不是问号，故后面应接陈述语句所以选D

选D。由题干知空白处缺少宾语，再结合选项易知应该填一个宾语从句。只有D项结构完整，语序正确，符合要求。句意：我不知道我们为什么应该做这件事。

I don't know his _______(话) 同义句转换:i don't know i've_____ _______.:i don't know i've_____ _______. i don't know what to say 同义句i _______ _______ _______ what to say I don't know how I can swim well.（改为简单句） I don't know ________ _______ _______well.I don't know how I can swim well.（改为简单句）I don't know ________ _______ _______well. I don't know. I don't know what shuold I do 的同义句是什么?I don't know _____ _______ _________ I don't know what I'm going to say at the meeting(改同义句)I don't know _______ _______ _______ at the meeting “i don't know you know i don't know I don't know where he _______ (hide) in the park.I can't find him 我不知道他为什么喜欢海豚：I don't know _______ _________ _________ _______. I don't know where I should go this afternoon.(改为同意句)I don't know _______ _______ _______this afternoon.爪机党手打不容易 I don’t know where the key is,but I suppose I _______ it at home. I know ______ is _______ brother,but I really don't like填单词 I don't know what I want _______(do).用正确形式填空 I don't know how _______(fly) the kite .I ask him______help(介) sorry,I don't know. i don`t know much I don't really know.