— ________ will win the first place in the relay race?—I don't know.A.Do you think whoB.Do you think which classC.Which class do you thinkD.Whom do you think
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C解析do you think作插入语，构成复杂疑问句的句式，即为“特殊疑问词+插入疑问部分+其余部分”．这样B和A在从句型结构上有错误，应给予排除．题中所缺少的是主语，不能用宾格whom，D也应排除．