单选题 The advertisement for Super Suds detergent ______ that the sale has increased by 25% in the first quarter of the year.
  • A. have been so successful
  • B. had been so successful
  • C. has been so successful
  • D. will be so successful
【正确答案】 C
【答案解析】[解析] 主语advertisement是单数形式，空格处的时态应与后面一致，答案是C。