nobody notices the thief slip inti the house because the lights happened to ___

问题描述:

nobody notices the thief slip inti the house because the lights happened to ___
a) be put up
b) give in
c) be turned on
d) go out
最好再解释一下

D 没有人注意到贼进了房子,因为灯碰巧熄了.
go out 熄灭