He was very busy that day，but he seemed when we dropped by．
A. unbearable
B. skeptical
C. delighted
D. challenging
网友回答
A. unbearable
B. skeptical
(答案→)C. delighted
D. challenging
解析：考查形容词辨析。unbearable 难以忍受的，skeptical 多疑的， delighted 高兴的，challenging挑战的，句意他非常忙，但是当我们拜访的时候他看起来很高兴。故选C。