单选题：Shortly after the accident, two____police were sent to the s

题目内容：

Shortly after the accident, two____police were sent to the spot to keep order. A．dozens of
B．dozens
C．dozen of
D．dozen

参考答案：

答案解析：

请论述清楚任务与练习的不同点，阐明其本质区别，并恰当举例说明。

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