If he_____ to the teachers attentively ,he _________ the answer to the problem now.
A had listened; would have known
B listened; would know
C listened; would have known
D had listened; would know
If he_____ to the teachers attentively ,he _________ the answer to the problem now.
A had listened; would have known
B listened; would know
C listened; would have known
D had listened; would know
D