Excellence is not difficult---simply decide right no

Excellence is not difficult
---simply decide right now to give it your best shot---__________ you will be amazed with __________ life gives you back.A.and; whatB.but; thatC.but; whoseD.and; whose

A解析考查固定句型和宾语从句。根据句型：祈使句+连词+陈述句 可知第一空为and; what life gives you back是一个宾语从句，what 在句中做give的宾语。句意：优秀并不困难。现在就做出决定全力以赴，那么你就会很惊讶于生活给你的回报。

我明天再问问老师，叫他解释下这个问题