He was watching her doing it with a look on her face, as if to say that she would not cha

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A. reliable
(答案→)B. determined
C. stubborn
D. straight
解析：考查形容词：A. reliable可靠的，可信赖的，B. determined有决心的，坚定的，C. stubborn固执的，D. straight直接的，句意：他看着她脸上带着坚定的表情做事情，好像说她不会改变主意的，选B。