新概念英语
问题描述:
新概念英语
They _________ a good time,______ they?
A have; do
B have; don't
C are having; are
D are having; aren't
答
D are having; aren't他们正玩得很快乐,不是吗?前肯定,后否定
而A 不符合前肯定,后否定的原则.并且时态不对; 同样B时态也不对;应该用过去时.
had.didn't为什么过去式