—Did Mary come to the party?—I don't know.She__while I was out.A.might have come B.might come为什么是A不是B

Question

—Did Mary come to the party?—I don't know.She__while I was out.A.might have come B.might come
为什么是A不是B

Answer 1

选A. 表猜测,因为已发生,所以用may/might +have done
我不知道,她或许来过.（我自己也不是很有把握）