The library's study room is full of students _ for the exam A:busily prepared B:busy preparing C:busily prepare D:are busily preparing

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The library's study room is full of students _ for the exam A:busily prepared B:busy preparing C:busily prepare D:are busily preparing

The library's study room is full of students _ for the exam A:busily prepared B:busy preparing C:busily prepare D:are busily preparing
The library's study room is full of students _ for the exam A:busily prepared B:busy preparing C:busily prepare D:are busily preparing

The library's study room is full of students _ for the exam A:busily prepared B:busy preparing C:busily prepare D:are busily preparing
选择:B: busy preparing 
解析
可以从句子的结构分析进行判断:
主要成分:The library's study room is full of students(图书馆自习教室坐满了学生)
伴随状语:busy preparing for the exam【这是形容词短语,也可以改写为时间状语从句(while they are) busy preparing for the exam(与此同时他们正忙于准备考试),其中用到了be busy doing sth(忙于做某事)句型】
【注】形容词短语可以用作伴随状语