Dear Teacher
When I did some incomplete sentence exercises I found this question that made me confuse:
“________ what to do, he just waited until his father arrived.”
A. Know not
B. Not know
C. No Knowing
D. Not knowing
I know in the sentence, Gerund and Infinitive can be a subject but I am not so sure this question.
Please let me know more about this.
Thank you in advance.