I haven’t been to London since I left my college.

I didn’t go to London when I left college.

B. The last time I went to London was when I left my college.

C. I have been to Londonsince I left my college.

D. I have been to London to visit my college.

The last time I went to London was when I left my college.

I have been to Londonsince I left my college.

I have been to London to visit my college.