what are Lucy and Mary doing they are busy______their homework.a.to do b.do c.on d.with快.

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what are Lucy and Mary doing they are busy______their homework.a.to do b.do c.on d.with快.
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what are Lucy and Mary doing they are busy______their homework.a.to do b.do c.on d.with快.
what are Lucy and Mary doing they are busy______their homework.a.to do b.do c.on d.with
快.

what are Lucy and Mary doing they are busy______their homework.a.to do b.do c.on d.with快.
同学,这题选D!
be busy with sth.