Helen ________ go on the trip with us but she isn’t quite sure yet.
A.shallB.mustC.mayD.can在线课程C
从转折词but的提示和she isn’t quite sure yet可以看出所用的情态动词表示的可能性不大。表示推测时must语气强,意思是“一定”;can表示“可能”,主要用于疑问句或否定句中,代替不可以用于否定句或疑问句的must;may表示“可能,也许”,但是把握不大,故选C。
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