問題補充：
單選題
Meng Peij ie，an ordinary girl who was among the 10 people awarded the title of “Touching China 2011”，must be both optimistic and strong-minded. Otherwise, she _______ her disabled adoptive mother for 12 years.A.mustn't have looked afterB.can't have looked afterC.couldn't have been looking afterD.shouldn't have looked after
