摘要： [2010·山西康杰中学5月模拟]He must be helping the old man to water the flowers, ? A. is he B. isn’t he C. must he D. mustn’t he 11B考查反义疑问句的构成.前文为肯定含义.后文用否定形式,根据前文的谓语动词形式可知用isn’t.

网址：http://m.1010jiajiao.com/timu_id_3587495[举报]