I read she's twenty-nine,but she must be (填in on at except) least forty.
问题描述：
I read she's twenty-nine,but she must be (填in on at except) least forty.
答
选 at least，固定用法
答
填at, at least短语意思是至少
答
at
答
at least是个常用搭配，意思是最少，大于等于……
答
at
at least 词组,至少