There______be an open window somewhere, I can feel cold air coming in.

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问题 There______be an open window somewhere, I can feel cold air coming in.

选项 A、should
B、must
C、seem
D、ought

答案B

解析 本题考查情态动词,根据后一分句,我觉得有冷空气进来,可知前一分句是对现在情况的肯定推测,肯定某处有窗子开着;谓语用must+动词原形。
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