They have to set out for the last train at once,________?( )
A. don’t they
B. do they
C. haven’t they
D. have they
第1个回答 2019-11-28
答案:A.本句是反意疑问句形式,前面是肯定形式,后面用否定形式,本句是一般现在时态,主语为they,前句有实意动词短语have to,所以助动词用do,所以后面的句式为don't they.故选A.