9. The doctor did all she could _____ the poor girl.
A. help B. helped C. to help D. helping
【分析】做题不细心的学生根据情态动词后面跟动词原形的思维定势而误选了A。但此句中的she could是定语从句she could do的省略式,其后的不定式短语在主句中作目的状语。故正确答案为C。
10. Mary thinks that she will visit her relatives next week,_____ she?
A. doesnt B. does C. wont D. will
【分析】一些学生一看到think后面的宾语从句,就运用think +宾语从句变反意疑问句的常规思路,误选了C。而实际上,当think,believe,suppose等作谓语,主语为第一人称时,反意疑问句中简短问句的助动词应根据宾语从句中的谓语动词进行变化,如果主语为第二或第三人称时,则应按照主句里的谓语动词来变化。因此答案为A。
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