Everyone is busy _____ homework now.

来源：百度知道 编辑：UC知道 时间：2024/05/03 03:25:12
详细的问题说明，有助于回答者给出准确的答案

with(be busy with sth 忙于某事）
doing(be busy doing 忙于做某事）

在这句话里两个结构都适用

in doing sth.
忙于做某事

Everyone is busy ( in ) homework now

短语 be busy in 忙于干....

填doing.
有固定结构：be busy in doing sth.
但in一般省略

填doing
be busy doing 是固定搭配

doing