题目内容
16.We know each other well because wehave been(be) friends since ten years ago.分析 我们彼此都很熟悉,因为我们自从十年前以来就是朋友.
解答 答案:have been.
现在完成时表示动作开始于过去,延续到现在,还有可能延续下去.构成:have/has+过去分词.根据"friends since ten years ago"可知我们从过去开始,就一直是朋友,一直持续到现在,还有可能延续下去,所以要用现在完成时,结合给出的英语提示be,所以要用have been,故填have been.
点评 首先要掌握现在完成时的用法,然后结合具体的语句,结合给出的英语提示,就可以确定正确答案.
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