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; what
B. but; that
C. but; whose
D. and; whose
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(答案→)A. and; what
B. but; that
C. but; whose
D. and; whose
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。