My mother,( )whether anyone would come home to help her,had to prepare the supper all by herself.A.did not knowB.not knowingC.had not knownD.having not know为什么选B?D为什么不行?
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