When young, work with every fiber of your being and when old, you’ll have little left about.
A. to plain
B. plaining
C. having plained
D. to have plained
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(答案→)A. to plain
B. plaining
C. having plained
D. to have plained
解析：考查不定式做定语：句意：当你年轻的时候，拼命工作，老了，就没有什么可以抱怨了。Have sth to do有什么要做的，选A。