She looked so young and （ ） that he felt a great desire to protect her. ( 章节：4 难度：4)
- A、vulgar
- B、sick
- C、vulnerable
- D、weaken
正确答案:C
答案解析:有
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She looked so young and （ ） that he felt a great desire to protect her. ( 章节：4 难度：4)
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