根据所给的释意，用恰当词语的正确形式完成句子。

来源：百度知道 编辑：UC知道 时间：2024/05/02 10:42:44
What are you doing?
I___________(am busy) writing the report at the moment.

am busy

be busy doing sth. 忙着做某事
He is busy reading the newspaper.
We are busy preparing dinner.
They are busy playing basketball.
Are you busy making model planes?

I am busy in writing the report at the moment.

in可以省略

be busy doing sth

用原型
be busy doing sth