____of his parents,he made great progress.

D
much 修饰to the delight 这个介词短语,应前置.或者说：
To his parents' 【great】 delight其它三个选项分别是什么意思？为什么不能选？much 这个副词的位置不对， 我不是说了吗？副词起强化作用修饰介词短语时要放在最前面再如：He is well above fiftyThe temperature drooped far below the ordinary levelHe is exactly like his father知道了 谢谢。