单选题 My mother ______ the windows already, so the room looks much brighter.
  • A. has cleaned
  • B. had cleaned
  • C. is cleaning
  • D. will clean


【正确答案】 A
【答案解析】[解析] 句中有already，用现在完成时态，同时“so the room looks much brighter”是因为“妈妈已经把窗子擦干净了”的结果，所以选A。