大家来看看这个语法题

甘草野菊

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.

答案是D...麻烦解释下后三个选项的对错之处吧~

多谢多谢~~~~

laladu101

CDE比较的时候可以发现主要是后半部分的区别。他想表达在睡着的浓度比醒着时的浓度要高。
C中看似sleeping与waking形式上是对应的，但是wake是个点动词，不能表达正在醒着的意思。
D中意思表达是在睡觉时的浓度比在清醒时的浓度要高，语义合理；且than的前后during很一致，结构合理.
E中说的是在一个更高浓度当睡着的时候比当醒着的时候。语义上不如D好，且说到asleep 与awake的，就应该考虑前面应该提到动作发起者。可是这句话里的主语是hormone,没提到人什么事。
整体比较D最好。

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