The old lady did not know ___________when the house caught f

The old lady did not know ___________when the house caught f The old lady did not know ____when the house caught fire. 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.为什么选C啊 The old lady didn't know___when the house caught fire.A how 14.The old man didn’t know _______ when the house caught fir did you see him__down the old lady?___Yes.The l the old lady looked upset .(对upset提问） ---did the old lady lo The father did not know to whom he should leave the house be the challenging friend I did not know The girl didn't know（）when the house caught fire.填空