he didn't know_____ when the house caught fire.A.what to do B.how to do it为何选A不选B?

My brother didn't know where he could buy an English book.(改为简单句) My brother didn't know_____ _____ _____ an English book. he didn't know_____ when the house caught fire.A.what to do B.how to do it为何选A不选B? 英语翻译他不知道外面发生了什么事 He didn't know_____ _____ _____outside（翻译）有what was happening这个短语吗?有的话,什么情况下用呢?高手们能否举几个例子? 英语翻译他不知道外面发生了什么事 He didn't know_____ _____ _____outside有what was happening这个短语吗?有的话,怎样区别?在什么情况下使用这种呢,高手能否举几个例子?急 初中英语完形填空55十条英语问题john had a meeting in the city hall(礼堂,大厅)at 10 o'clock last tuesday,but he didn't know_____(66)that was.when he walked out of thestation,he saw____(67)old man in front of a small shop and he went__ you know ____?No,they don't know_____.Do you know ____?No,they don't know_____.A.me me B.you me C.he he D.you I 选哪个?为什么? I don't know the boy.Do you know_____(he)用所给词的适当形式填空 1.he doesn't know_____ _____.(该穿什么) 2.he_______(可能不认识）anyone at the Party. I don't know_____ _____ ______. the boy didn't know_____ .a.which chair to sit on b.which chair to sit选 A对吧.CHAIR做宾语,所以加ON He didn't do his homework yesterday. He said something () i didn't understand. 英语翻译he knew _______buthe didn't know______. He Didn't Have To Be 歌词 He Didn'T Have To Be 歌词 he didn't come yesterday because he was ill.he didn't come yesterday【】【】his【】 He didn't come because he was ill.=He didn't come because of his__. he said he would come,he didn't,t__________