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16.Snorkeling trips are great fun but they ________ be very dangerous underwater.(  )
A.canB.mustC.shallD.will

分析 浮潜之旅非常有趣,但水下也可能很危险.

解答 答案:A
题干中but表示转折关系,前面说的是有趣,后面说有危险,应该是表示不肯定的推测.故选A.

点评 情态动词的用法是英语中常考的语言点.通常考查的方式有虚拟和推测,本题考查的是情态动词的推测用法.学习时要注意积累.

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