题目内容

9．The discovery ______ a major effect on the treatment of heart disease．（　　）
A．is going to haveB．is to have
C．Used to haveD．has to have

分析 这项发现可能在对心脏病的治疗上起重要的影响．

解答 答案：B，used to do表示"过去常常做某事"，have to表示"不得不"，意思与题干不符，先排除，A be going to表示"将要发生或打算进行的动作"，B be to do表示"事先商定、安排或准备要做的事情，也可表示一种可能性"，根据题干"这项发现对心脏病的治疗只是将来可能起重要的作用"，故答案为B．

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