If you have difficulty ____________ a particular book, please ask one of the librarians for assistance. ( 章节：3 难度：3)_做题室

单项选择题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：
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