Not having worked out the problem, ________ leave the office.
A. so he was not allowed to B. and he didn't want to
C. the teacher couldn't make him D. he couldn't free himself to
Not having worked out the problem, ________ leave the office.
A. so he was not allowed to B. and he didn't want to
C. the teacher couldn't make him D. he couldn't free himself to
D