从后面的【or】表示还有别的【途径】了解,故用may.不用must.
如没有后面的【or.】选must
— Why does Sara know so much about Angkor Wat?
— Why does Sara know so much about Angkor Wat?
—She ____ have been there,or...
答案是may 为什么不填must?
—She ____ have been there,or...
答案是may 为什么不填must?
英语人气：795 ℃时间：2019-12-09 03:20:44
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