题目内容
10．明天她不得不在家照看她弟弟．Shehas tolook after her little brother at home tomorrow．
分析 has to．
解答 答案：has to．
结合句意表达的是客观事实用一般现在时，表示不得不做某事，结合后面的动词原形look用have to do sth，主语she，故has，故答案是has to．
点评 have to表示客观需要做的事情，意思是"必须"、"不得不"．后跟动词原形，有人称、
时态和数的变化，与情态动词 must 近义．
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