问题补充:
— John, could you please the black-board now? It’s your duty today.
— OK. I’ll do it right away.
A. not to clean
B. to clean
C. not clean
D. clean
答案:
A. not to clean
B. to clean
C. not clean
(答案→)D. clean
解析:句意:约翰,现在能请你把黑板擦了吗?今天该你值日。——好吧,我立即做。句式could you please后面接动词原形,表示客气的请某人做某事,故选D。