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None of the students (understand)what he (say)did they

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None of the students (understand)what he (say)did they
None of the students understood what he said,did they?
一般来讲none of +人即使人用复数形式,其后面的谓语动词也一定用单数.但在此句中,后面用来表达反义疑问的did they,表明了此句的时态为过去时,从而被反义疑问的understand即应用过去时understood,同样understand的内容是“他说的”也是已经说过的,所以也用过去式.