单选题
[阅读选择]People suspected that “Lucky”， as he was called by friends， wanted to kill his wife he no longer lived with. They say that Lucan entered his old house and in the dark， killed the nanny by mistake. His estranged wife heard noises， came downstairs and was also attacked， but managed to escape. Seven months after the murder， a jury concluded that Lucan had killed the nanny.
It is thought that Lucan killed the nanny because______.
A.she was looking after the children
B.she was a friend of Lucan's
C.it was dark and he thought she was Lady Lucan
D.Loard Lucan thought the nanny stole his car
正确答案：C
答案解析：答案选C。因果关系题。对照本段People suspected that“Lucky”，as he was called by friends, wanted to kill his wife he no longer lived with. They say that Lucan entered his old house and in the dark，killed the nanny by mistake.本来是要杀他的妻子，可是因为天太黑，所以错杀了保姆。答案选C。