23.---You could have asked Mr. Richards for help. He is kind-hearted.

----Yes. But that ____him a whole day.

A would have taken      B. had taken                 C. would take    D. would be taken

【解析】A：本句为承前省略的虚拟语气主从复合句，还原后为：If I had asked Mr. Richards for help, that would have taken him a whole day.