― 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

—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 _______ there,or she may have read about it.?

A. must have been?

B. shouldn’t have been?

C. may have been?

D. can’t have been?