问题

Jack had prepared for the game for such a long time. We all thought he ________ it. — What a pity! He ________ too nervous when playing it.
A:would have won;had been
B:could have won;must be
C:could have won;was
D:would have won;has been
B:could have won;must be
C:could have won;was
D:would have won;has been
正确答案是: