he didn't know_____ when the house caught fire.A.what to do

he didn't know_____ when the house caught fire.A.what to do He didn't know ____when the house caught fire.A how to do it The girl didn't know（）when the house caught fire.填空 1.The old lady didn't know ( ) when the house caught fire the old lady didn't know ___ when the house caught fire. The old lady didn't know___when the house caught fire.A how 请问he found his house in a mess and he didn't know what to do The old lady didn't know___when the house caught fire.为什么选C啊 The boy didn't know___.A：what to do it B：what to do C：when t He didn"t know what to do the next day 14.The old man didn’t know _______ when the house caught fir I really don`t know_____ A.what to do it B.how to do C.what