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.为什么选C啊 The old lady didn't know___when the house caught fire.A how 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 did not know ____when the house caught fire. The girl didn't know（）when the house caught fire.填空 He didn't know ____when the house caught fire.A how to do it he didn't know_____ when the house caught fire.A.what to do 14.The old man didn’t know _______ when the house caught fir The old lady did not know ___________when the house caught f The children should be taught when the house caught fire.为什么 The old lady looked ___ at the dirty boy and didn't know wha