--Why does Sara know so much about Angkor Watt? --She ______ have been there, or

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问题 --Why does Sara know so much about Angkor Watt? --She ______ have been there, or because of some other reasons.

选项 A、must
B、oughtn’t to
C、may
D、can’t

答案 C

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。

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