时态填空 -The classroom is so clean.When__you___it(clean)it?-We clean_英语解答

时态填空 -The classroom is so clean.When__you___it(clean)it?-We cleaned it twenty minutes ago.

人气：323 ℃　时间：2020-02-04 06:38:00

解答

did clean可用have cleaned吗，强调过去打扫后对现在造成的影响但是后面有时间暗示啊ago