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

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.