题目

 Knowing how long the test would last, the students who finished ____ back and waited until the end of the exam. A. settle     B. settled    C. settling    D. to settle 答案：.B 解析: 该题考查句子结构。学生易犯思维定势的错误而选C，其实who finished是定语从句，该处缺谓语动词。

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