问题补充：
As the final examination is coming , the students are busy it.
Apreparing
Bpreparing for
C. prepare
D. prepare for
答案：
A. preparing
(答案→)B. preparing for
C. prepare
D. prepare for
解析：考察busy和prepare的用法。Be busy doing，忙着做……，根据题意句子中指的是为……准备，故选B，由于期末考试要到了，学生们都在忙着准备考试。
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