Im going to be a volunteer in the international conference where I want to be () in the language.

科目名称：人文英语2

试卷号：23937

题型：词汇与结构(单选题)

题目：Im going to be a volunteer in the international conference where I want to be () in the language.

选项：A. useful B. careful C. helpful

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答案：C. helpful