I lost the key ,and I really don't know_______.A what should I do Bwhat to do C how to doD how shall I do,应该选什么 ,为什么?

I lost some(key) What has happened?What has happened?---I have lost my key and can't open the door.为什么不能用What happened?---I lost my key and i can't open the door.两者的区别是什么? in,the,that,your,and,lost,found,box,key,is Albert found the key.I lost the key yesterday.（合成一句） Albert found the key.I lost the key.(合成一句) Xiao Wang found the key.i lost the key yesterday变为定语从句 Albert found the key ( ) ( ) yesterday.Albert found the key. I lost the key yesterday.(合并为一句） What-------? I --------my key and can't open the door.A.happened;lostB.has happened;lostC.happens;have lostD.has happened;have lost选哪个?为什么? He lost the key ____ the door 英语的.把 key,your,lost,is,in,found,the,case,and 连词成句 in the that your and lost found case key is连词成句 in,the,that,your,and,lost,found,case,key,is,)连词成句 key some are the lost and found case in连词成句 请快速回答 回答.in,the,that,your,and,lost,found,box,key,is A lot of ____(key) are in the lost and found case. Xiao Wang found mo the key ______ I lost yesterday.A.which B.what I,the,key,of,my,home,lost,yesterday.连词成句 I can't open the door,for I___the key to itAlosingBloseChad lostDhave lost