以下为英文表达:
I am afraid I can't reply you immediately,because I am studying hard for the exam.
你好,你给的句子应该是
I'm afraid I can't answer you in time because I'm studying for the text。
在英语中,冠词+时间可以代表时间状语,而且像the moment,the minute,the instant这些词还可以引导时间状语从句
不过in a minute当然也是可以的 a minute主要还是一个口语化的表达。
我恐怕不能及时回复你,因为我正在为了考试而努力学习。
I'm afraid I can't write back to you on time because I am working hard for the exams .