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isn t it oBvious

Professor: Yes, that's such a difficult point isn't it? 重听题,问...答案是She thinks that the answer to the question is obvious...

that在本句中只是引导主语从句,在从句中不作成分。填what不行,因为what在从句中要作成分,可以作主语,表语或宾语,而本句中从句中不缺成分,所以填what是不行的。如 What he said at the meeting is true. 他在会上说的是真的。what在从句中...

应该跟时序约束相关,看看原来的工程里面的 .sdc文件是否拿过来了。(Assignments--Settings--TimeQuest Timng Analyzer) 还有就是看看Fitter Settings中优化...

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