单选题 --Why does Sara know so much about Angkor Watt?
--She ______ have been there, or because of some other reasons.
  • [A] must
  • [B] oughtn't to
  • [C] may
  • [D] can't


【正确答案】 C
【答案解析】[考点] 情态动词
[解析] A表示对过去所做某事较为肯定或较有把握的猜测；D表示不应该做过；C表示可能做过；D表示不可能做过。