2. 外语
  3. I know that they (talk) ______ since morning.

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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