mrs smith looks very busy we went to help her but we don't k

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mrs smith looks very busy we went to help her but we don't knoe__求大神详细讲解和求详细讲解选项

Mrs Smith looks very busy.We want to help her,but we don’t know _______.
A.what to do it B.how to do C.what to do D.why to do
是这道题吧
选C
D不论是意思还是用法都错了
首先意思……我们不知道为什么要做（前面说了因为看见别人忙要帮助,但这里却说不知道为什么.自相矛盾）
其次,一般why的语法知识
why not do sth=why don't you do sth.为什么不做某事呢?

mrs smith looks very busy we went to help her but we don't k Mr.Zhu looks very busy.We want to help him,but we do not kno She looks very sad.I want to help her but I don't know____to en.She is very busy,i want to help her .but I don't know ___ We don't have to go very far _______ we need help with our h Mrs.smith went to see her husband secretary. 是：we don't have the same looks ,but we are good firend! we don't have the same looks ,but we are good friends.为什么不用a We tried to help her,but she r______ We are going to have a sports meeting tomorrow.But I don't k Hong Kong is very ,very busy,and we went to Hong kong island we don't have the same looks.