Teachers are busy ________ the test while the students are busy ________ the test．A.preparing; preparingB.preparing for; preparing forC.preparing; preparing forD.preparing for; preparing
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C解析句意为：“老师在忙着出试卷，而学生们在忙着为考试作准备。”prepare sth．“准备……”；prepare for sth．“为……作准备”。