My mother,（ ）whether anyone would come home to help her,had to prepare the supper all by herself.
问题描述：
My mother,（ ）whether anyone would come home to help her,had to prepare the supper all by herself.
A.did not know
B.not knowing
C.had not known
D.having not know
为什么选B?D为什么不行?
答
分词的否定式都必须是在分词前加not,而不是在后面
如：Not having received her letter,the manager caller her from his office.
He left the room,not saying a single word.你好,所以D项如果改成not having know 也可以么？