his aunt ______ be here now,she has just gone to the librarymay not还是must not
问题描述：
his aunt ______ be here now,she has just gone to the library
may not还是must not
答
mustn‘t
答
can't： 意思是，他的姑姑不可能在这儿，她刚刚去图书室了。can't 表示有把握的否定。
答
must not
答
may not 表推测, " 可能不, 也许不"
答
都不对
否定推测应该是 can't