I'm sorry ( ) you working so long.(keep)我个人认为是to have kept,⑴I’sorry to do⑵so long 说明已经发生用现在完成时,综合起来为动词不定式的完成时态,只是不确定,希望能指出对错!

来源:学生作业帮助网 编辑:作业帮 时间:2024/08/17 01:04:36
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