对于情态动词加现在完成时表反问,如何判断有无过去时间标志?比如He may have killed someone,为什么反问用didn't he?还有He couldn't have been to the US before,为什么用has he ?
来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 05:58:20
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