On Saturday the police gave a () presentation to help locals keep their community crime free.

科目名称：人文英语3

试卷号：11379

题型：词汇与结构(单选题)

题目：On Saturday the police gave a () presentation to help locals keep their community crime free.

选项：A. two hours B. two hour C. two-hour

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答案：C. twohour