his aunt ______ be here now,she has just gone to the librarymay not还是must not

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his aunt ______ be here now,she has just gone to the librarymay not还是must not
his aunt ______ be here now,she has just gone to the library
may not还是must not

his aunt ______ be here now,she has just gone to the librarymay not还是must not
都不对
否定推测应该是 can't

may not 表推测, " 可能不, 也许不"

mustn‘t

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。

must not