问题

You didn’t wait for Mr. Black last night, did you——No, but we ____. He didn’t return home at all.
A:couldn’t have
B:needn’t have
C:didn’ t need to Dshould wait have
D:should wait have
B:needn’t have
C:didn’ t need to Dshould wait have
D:should wait have
正确答案是: