Please make sure every student knows ------if the building catches fire .这个空是填what to do 还是how to do it ,为什么?

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Please make sure every student knows ------if the building catches fire .这个空是填what to do 还是how to do it ,为什么?
Please make sure every student knows ------if the building catches fire .
这个空是填what to do 还是
how to do it ,为什么?

Please make sure every student knows ------if the building catches fire .这个空是填what to do 还是how to do it ,为什么?
从语法上,都可以的.

how to do it

how to do it 这句翻译成请确保每个学生都知道如果大楼着火该怎么做,what to do 表示做什么而how to do表示怎么做,强调的是某种方式。