I know that they (talk) ______ since morning.have been talking我知道自早上开始他们就一直讲个不停。

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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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Iknowthatthey(talk)______sincemorning.havebeentalking我知道自早上开始他们就一直讲个不停。