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― Why does Sara know so much about Angkor Wat?

― She ________have been there, or...

A. must　        B. oughtn't to       C. may　           D. Can't

 ----- Why does Sara know so much about Angkor Wat?

  ----- She _________ have been there, or….

  A. must  B. oughtn’t to   C. may  D. can’t

—Why does Sara know so much about Angkor Wat?

—She ______ have been there, or…

A．must                  B．ought to                    C．can                    D．may

—Why does Sara know so much about Angkor Wat?  
—She _____ have been there, or…
  A. must       B. oughtn’t to      C. may       D. can’t