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She_____writing the report after breakfast and handed it in at noon.
A.set offB.set down C.set outD.set about
D

试题分析:此处set off 引爆;set down写下,记下; set out开始着手做某事;后接不定式;set about开始做某事,后接动名词。故选D。句意:他早饭后开始写报告,中午就交上了。
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