题目

---I feel the house shaking. ----So do I .It ___ must be sign of an earthquake most probably. Let’s hurry to leave here. A. ought  to B. could  C. can  D. might 答案：A 解析: 由句意“这应该是很可能要发生地震的信号吧”可知，这里表示肯定的推理且含有很大的可能性，故用ought to 【标签】情态动词表推测

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