1.翻译当我们上山时,天气为什么会变得更冷?我们可是正在离太阳越来越近的呀.
所以选B.should 表示惊讶,不理解
2.翻译:
——我们没看见他来参加昨天的演讲.
－－他不可能昨天来了.
所以按语境选B.另外,A不选的原因是：情态助动词+不定式的完成式中没有mustn't have done的结构,更不用说用它来表示“过去不可能做过某事”.但must have done这种结构是有的,解释为“一定已做”.从中可知must要与have done用的话,应是用表肯定,而不是否定的形式.
1,Why____it get colder when we go up a mountain?We are getti
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