The teacher,（）whether anyone would come to help him, decided to prepare for the experiment by himself.
A.
not knowing
B.
not to know
C.
knowing not
D.
to have not know
正确答案是A
The teacher,（）whether anyone would come to help him, decided to prepare for the experiment by himself.
The teacher,（）whether anyone would come to help him, decided to prepare for the experiment by himself.
A.
not knowing
B.
not to know
C.
knowing not
D.
to have not know
正确答案是A