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

分析 浮潛之旅非常有趣，但水下也可能很危險．

解答 答案：A
題干中but表示轉(zhuǎn)折關(guān)系，前面說的是有趣，后面說有危險，應該是表示不肯定的推測．故選A．

點評 情態(tài)動詞的用法是英語中常考的語言點．通�？疾榈姆绞接刑摂M和推測，本題考查的是情態(tài)動詞的推測用法．學習時要注意積累．

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