问题描述:

单选题

Mr Green went to Shenzhen on business last week, ________?A.isn't heB.doesn't heC.didn't heD.hasn't he

网友答案:
C解析陈述部分的谓语动词是实义动词,且用的是一般过去时,附加问句部分要用助动词do的相应形式.
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