We learned____to do when there is a fire.填how吗如上

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We learned____to do when there is a fire.填how吗如上
We learned____to do when there is a fire.填how吗
如上

We learned____to do when there is a fire.填how吗如上
我认为应该用what,若要用how,则应该是how to do it
在宾语从句中,what 是代词 做 to do 的宾语,how 是副词 做 to do it 的状语.