_____,the boy couldn't enter his house.A.Since the key has lostB.The key been lostC.Lost the keyD.Having lost the key答案应该选B?为什么不能选ACD?请说明理由,谢谢~

The shopkeeper couldn't prove that theboy had stolen the money._____ _____ ______ ______ from the shopkeeper that the boy had stolen the money. _____,the boy couldn't enter his house.B.The key_____,the boy couldn't enter his house.B.The key been lost D.Having lost the key为什么D不可以? The boy tired _____ away The boy was lost .改为同义句The boy couldn't ________ his _____back home.They enjoyed themselves very much in the park.they _____ a good ______in the park. _____ the boy _____ (come) from China? seeing this,the little boy couldn't help____（笑）. the boy was lost 同义句 the boy couldn't ___his___back home. 改为同义句,每空一词1、She was so weak that she couldn't take care of her babyShe was _____ _____ _____ take care of her baby2、The boy is so old that he can go to school by him selfThe boy _____ _____ _____ _____to school by himself 3、Th The boy was lost.改为同义句每空一词The boy _____ _____.The boy _____ his _____. Is the boy _____ in the river? _____,the boy couldn't enter his house.A.Since the key has lostB.The key been lostC.Lost the keyD.Having lost the key答案应该选B?为什么不能选ACD?请说明理由,谢谢~ So frightened ( )that he couldn't say a wordA.the boy was B.was the boy C.did the boy be D.be the boy Here _____(come) the boy.咋做 the boy _____(come) here soon The boy was _____（play）basketball . look,the boy _____ football over there. The lazy boy always late _____ school. The boy _____(name) Sun Lei.