问题补充:
. 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
答案:
解析:考查形容词作状语。短语:忙于做某事be busy doing, busy preparing在题中做后置定语。句意:图书馆的学习教室挤满了为考试忙着准备的学生。故选B。
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