He was watching her doing it with a look on his face as if to say that he would not chan

问题补充：

He was watching her doing it with a look on his face, as if to say that he would not change his mind.

A. determining

B. determined

C. surprising

D. surprised

答案：

A. determining

(答案→)B. determined

C. surprising

D. surprised

解析：考查形容词：A. determining B. determined有决心的，修饰人，C. surprising令人惊讶的，修饰物，D. surprised感到惊讶的，修饰人，他带着坚定的表情看着她，好像在说他不会改变主意的。选B。