单选题 Research findings show we spend about two hours dreaming every night, no matter what we ______ during the day.
  • A. should have done
  • B. would have done
  • C. may have done
  • D. must have done
【正确答案】 C
【答案解析】[解析] C项“may have done”(可能做了什么)，其他几项用法，意义或语气都不对。