The English idiom "_______" means "something usel

The English idiom "_______" means "something useless and unwanted but big and costly"
A、white elephant
B、flesh and blood
C、an apple ofdiscord
D、fly in the ointment
【正确答案】：A
【题目解析】：题干中四个习语的意义是固定的，所以A选项（大而且无用的东西）符合要求。见课本第163页。