The teacher is busy ______teaching.

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The teacher is busy ______teaching.
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The teacher is busy ______teaching.
The teacher is busy ______teaching.

The teacher is busy ______teaching.
with

The teacher is busy ( in ) teaching.

with

with

be busy about/with sth
或be busy (in ) doing sth

with
be busy with sth/doing sth 这个短语表示忙于干什么~