be busy with doing 和be busy in doing 在用法上有何区别如题
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be busy with doing 和be busy in doing 在用法上有何区别如题
be busy with doing 和be busy in doing 在用法上有何区别如题
be busy with doing 和be busy in doing 在用法上有何区别如题
be busy with 后直接接名词;而be busy in 后接doing