Is the answer to this question B? I graduated from college for many years. Limit is just a very shallow concept. But when I saw this problem, I felt that I could still solve it in my own way. X is close to 3. Look at A, the numerator is a negative number close to 0, and the denominator is a positive number close to 0, which means that he is close to-1. Option c, I remember that the image of the function of SINX seems to be a shape with a symmetrical origin, and X-3 is a negative number close to 0, which is an infinitesimal negative number in one third. In fact, in any case, the role of SINX will not be infinitely small. D option X- 1/3 just said it is infinitesimal negative number, so it can be seen that d should be infinitesimal within the range of positive numbers, b option 3-X is infinitesimal positive numbers, and b is infinitesimal within the range of all real numbers. I almost forgot the high number. But that's all I remember. I don't know if it's right. Don't blame me if it's wrong. Ha ha.