【題目】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】考查定語從句。句意：保持一個(gè)有規(guī)律的睡眠時(shí)間對(duì)于設(shè)定一個(gè)嬰兒的生理鐘是重要的，研究者表明這應(yīng)該在大約四個(gè)月大的時(shí)候被固定。空格處引導(dǎo)非限制性定語從句，代指前面一句話，在從句中作賓語，故選B。

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