填空题 Mr. Smith is Sandy's geography teacher and asked Sandy to write a paper.
Mr. Smith 1 asked Sandy to write a paper.

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【正确答案】 1、who is Sandy's geography teacher    
【答案解析】[解析] 此句考查后置定语从句。给出的句子是个并列句，而要求的句子从结构上我们可以判断出来是个带定语的复合句，所以我们要在主语后加一个定语。先行词是人，引导词应为who，所以答案为who is Sandy's geography teacher．