选择一项: A. I am a little sad. B. It.s been a difficult day. C. It doesn.t matter.
答案是:B. It's been a difficult day.解析:本题考核“表达情感”情境下的交际用语。第一说话人认为对方今天看上去心情不好,询问其原因。因此对方应该回答造成心情不好的原因即可,答语应用It's been a difficult day. (这是艰难的1天。)来回应,所以选选项“It's been a difficult day.”。