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-What kind of apartment are you looking for?- It has to be c

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-What kind of apartment are you looking for?- It has to be cheap.
It has to be cheap.为什么加be
-What kind of apartment are you looking for?- It has to be c
e就是系动词,形式为am,is,are,如果没有has to,那就是It is cheap;
has/have to意思为:必须,不得不
大多数不定式(to)后面要加上 动词原形,而这里面的动词是是系动词,原形就是be.