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问题: 英语

-I heard they went skiing in the mountains last year .
-It () be true because ther was little snow
there .
A could't B mustn't

解答:

A
couldn't表示否定推测
mustn't表示不许、禁止做某事
-我听说他们去年去山里滑雪了。
-那不可能,因为去年那儿没什么雪。