判断正误，英语题目，对了t；错了f，并改正。

Question

she said she has already sent the letter to us( )
I heard she was twenty,but she must beleast thirty years old.( )

Answer 1

she said she has already sent the letter to us(T )
I heard she was twenty,but she must beleast thirty years old.( F )
正确的是：
I heard she was twenty,but she must be at least thirty years old.
at least 是一个介词短语，意思是【至少】

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