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：
