She is at least five years old 和She must be at least five ye

She is at least five years old 和She must be at least five ye she must be at least thirty five years old.in ma opinion she She must be at least thirty-five years old.In my opinion she 用must或can't填空 1、that woman ( ) be at least 50.she looks old She must be at least forty.请问其中的at least是副词,还是介词短语,用来修饰哪个词? "She must be at least forty ."为什么要在must前加be? she is [five years old]提问 She must play the piano for at least one hour.(对for at least 连词成句 1.must she forty least be at 2.not he is than more twen she hope she_____(be)there at five. 英语,Doctors study for at least five years after they finish s at that time she was only a five years old girl.