Look! There’s no light on—Sara _____be at home.
A．can’tB．mustn’tC．needn’tD．shouldn’t
A
考查情態(tài)動(dòng)詞表示推測的用法：A. can’t不可能，B. mustn’t 表示推測只能用肯定，C. needn’t不必，D. shouldn’t不該，句意是;看，燈不亮了。--Sara一定不在家。選A。
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