If you have difficulty ____________ a particular book, please ask one of the librarians for assistance. ( 章节：3 难度：3)
- A、to locate
- B、locate
- C、locating
- D、of locating
正确答案:C
答案解析:有
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If you have difficulty ____________ a particular book, please ask one of the librarians for assistance. ( 章节：3 难度：3)
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