标题: 大家来看看这个语法题 [打印本页] 作者: 甘草野菊 时间: 2010-6-6 14:35 标题: 大家来看看这个语法题 The human growth hormone, made by the pituitary gland, is secreted （during sleep in higher concentrations than when awake.)-----括号内为划线部分
A. the same B. when sleeping in higher concentrations than waking hours C. in higher concentrations during sleeping than waking D. in higher concentrations during sleep than during waking hours E. in higher concentrations when asleep than when awake.