--Sorry, it's already 6 o’clock. I have to be off for an appointment.
--OK. .
A. It couldn’t be better
B. You really have me there
C. Let’s call it a day
D. Take your time
网友回答
A. It couldn’t be better
B. You really have me there
(答案→)C. Let’s call it a day
D. Take your time
解析：句意：--对不起，六点了，我得离开去赴一个约会。--好吧，今天就到这里吧。It couldn’t be better它是最好的；You really have me there你真的让我去那里；Let’s call it a day今天就到这里吧；Take your time别着急，慢慢来。根据句意故选C。