问题标题：
Peoplehavelearnttheimportanceofkeepingabalanceddiet_____theirnutritionalneeds．（）A.satisfyB.satisfiedC.tosatisfyD.havingsatisfied
问题描述：
People have learnt the importance of keeping a balanced diet _____ their nutritional needs．（）
A.satisfy
B.satisfied
C.to satisfy
D.having satisfied
史天艺回答：
答案：C．根据People have learnt the importance of keeping a balanced diet _their nutritional needs．可知人们保持均衡饮食是为了满足营养需求，在这里tosatisfy theirnutritionalneeds作目的状语，表示知人们保持均衡饮食的目的是为了满足营养需求．故选C．
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