Mrs Black doesn't believe her son is able to design a plane,__?
问题描述：
Mrs Black doesn't believe her son is able to design a plane,__?
A.is he B.isn't he C.doesn't she D.does she
答
选D
像believe, think 这样的动词作谓语,如果主语是第一人称,变成反意疑问句时,后面的疑问部分和从句中的人称和时态保持一致,但是如果是其他人称,则和主句的主语和时态一致,所以本题选D,主语的语语是Mrs Black,时态是一般现在时,前否后肯.
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