Li Lei is often busy _______ his homework_______Sunday如题 第一个空填 at 还是 with 第二个填on

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Li Lei is often busy _______ his homework_______Sunday如题 第一个空填 at 还是 with 第二个填on
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Li Lei is often busy _______ his homework_______Sunday如题 第一个空填 at 还是 with 第二个填on
Li Lei is often busy _______ his homework_______Sunday
如题 第一个空填 at 还是 with 第二个填on

Li Lei is often busy _______ his homework_______Sunday如题 第一个空填 at 还是 with 第二个填on
with
on
be busy with sth
其实填doing也行,be busy doing sth也是忙于某事的意思