For example, f (x) = 0 (x
f(x)= 1(x & gt; a)g(x)= 0(x & gt; answer
In this way, the limit of f(x)+g(x) at A is obviously 1, excluding A and C. .
Another example is f (x) = 0 (x
f(x)= 1(x & gt; a)g(x)= 2(x & gt; answer
In this way, f(x)+g(x) has no limit at A, and B excludes it. .
So it can only be D.