题目内容：

Mrs.Mallory__foreign food,so she didn't know what to expect
A wasn't used to eating B usedn't to eating
和 B 错误原因.

优质解答

be used to doing sth 是习惯做某事的意思,这里是它的否定式,符合题意,而B,usedn't to 是过去常常做某事的,意思,后面要接动词原形.