I think you'd better not risk la, for HKU, minimum requirement for UE is D, may be you can consider other university la......
actually not even HKU BA, other faculties won't have you as well..and please remember if you get E in UE, even if HKU has you, you will have a hard time keeping up with the courses because all the courses are taught in English (except Chinese of course). Most of the lecturers are either British or American. HKU BA is a bit different from other faculties as we really use English for lectures.
So, friend, I really recommend you not to try HKU la......