manage to diet and exercise还是manage to diet and to exercise,说清为什么,

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manage to diet and exercise还是manage to diet and to exercise,说清为什么,

manage to diet and exercise.
因为按照语法的"平行结构" 分析, 是要在exercise后面加to的, 可是在这种情况下一般省略to因为避免重复.