I know that they (talk) ______ since morning.

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问题 I know that they (talk) ______ since morning.

选项

答案have been talking

解析 我知道自早上开始他们就一直讲个不停。本题考查的是动词的时态.从某一时间到另外一个时间一直在做某事应该用完成进行时,根据主句谓语动词know可知用现在完成进行时,所以正确答案是have been talking。
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