_____,the boy couldn't enter his house.A.Since the key has lostB._英语解答

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

人气：447 ℃　时间：2020-04-16 17:57:05

解答

首先,lose是瞬时动词,不能用完成时,所以AD是错的.
其次,后半句的主语是the boy,如果选C应该用losing the key；由于前后的逻辑主语不同,B在此处为独立主格结构.