填空：学生们正在为即将到来的考试而忙碌地准备着.The students are busy _ _ the coming exam.
问题描述：
填空：学生们正在为即将到来的考试而忙碌地准备着.The students are busy _ _ the coming exam.
答
preparing for
be busy (in) doing 忙于做某事
prepare for 为..做准备