Shewriting the report after breakfast and handed it in at noon.A. set offB. set down C. se

问题补充：

Shewriting the report after breakfast and handed it in at noon.

A. set off

B. set down

C. set out

D. set about

答案：

A. set off

B. set down

C. set out

(答案→)D. set about

解析：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。