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    【题目】Keeping a regular sleep schedule is important for setting a baby's body clock,_______researchers note should be in place by about 4 months of age.

    A. whose B. which C. when D. where

    【答案】B

    【解析】考查定语从句。句意：保持一个有规律的睡眠时间对于设定一个婴儿的生理钟是重要的，研究者表明这应该在大约四个月大的时候被固定。空格处引导非限制性定语从句，代指前面一句话，在从句中作宾语，故选B。

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