I am busy _____for the exam. (说明原因)

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Iambusy_____fortheexam.(说明原因)Iambusy_____fortheexam.(说明原因)Iambusy_____fortheexam.(说明原因)stugyingbebus

I am busy _____for the exam. (说明原因)
I am busy _____for the exam. (说明原因)

I am busy _____for the exam. (说明原因)
stugying
be busy doing 语法
study for the exam 固定用法

preparing
be busy doing sth prepare for sth
固定用法

I'm busy studing for the exam 我正忙着学习,准备考试