Last night, Ma Hui either went to the gym to play ball, or went to visit his teacher Qin Nan  If Ma Hui drove last night, then he did not gymnasium to play ball  Only if Ma Hui and his teacher Qin Nan agreed in advance, he would Go to visit his teacher
In fact, Ma Hui and his teacher Qin Nan didn't make an agreement in advance
Ma Hui visited his teacher Qin Nan last night