问题补充:
, 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:
A. Since the key has lost
B. The key been lost
C. Lost the key
(答案→)D. Having lost the key
解析:考查非谓语动词。主语the boy与lose之间是主谓关系,所以用现在分词,且分词的动作发生在谓语动词之前,所以用现在分词的完成式。句意:丢了钥匙之后这个小男孩不能进入他的房子。所以选D。