问题
Never before ______ to ______ what his parents expect of him more than it is today
A:he has failed; live up to
B:he failed not; come up with
C:has he failed; live up to
D:did he failed; come up with
B:he failed not; come up with
C:has he failed; live up to
D:did he failed; come up with
正确答案是：
