How pleased the detective was what his customer told him!
A. hearing
B. to hear
C. heard
D. to hearing
网友回答
A. hearing
(答案→)B. to hear
C. heard
D. to hearing
解析：这题考查不定式做形容词的宾语，be +adj+to do，这是感叹句，正常的句子是： the detective was pleased to hear what his customer told him，选B。句意是：听到顾客告诉他的事侦探多么高兴啊。