—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?
C?
此題考查情態(tài)動詞表推測的用法。由后面or...來判斷，說話人對此事不是很有把握，故用may have done表示對過去情況不太肯定的推測，意為“或許做了某事”。must have done用于肯定句，表示對過去情況肯定的推測，意為“一定發(fā)生了某事”。
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