he is busy ______(write) a letter to his friend.

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he is busy ______(write) a letter to his friend.

he is busy ______(write) a letter to his friend.
he is busy ______(write) a letter to his friend.

he is busy ______(write) a letter to his friend.
he is busy ______(write) a letter to his friend.
writing
他正忙于写信给他的朋友.
be busy doing 忙于做某事

busy+ with/at/in sth
busy+ doing sth
比如
He is busy at work.
他忙着工作。
I am busy writing a novel.
我正忙于写小说。
Jean is busy with her work.

writing
busy+doing

writing
be busy (in) doing sth

writing

be busy doing忙于做某事
所以,应该填writing