单选题 If the team was in financial trouble, would the owners sell stock to fans to keep them ______?
  • A. high
  • B. out
  • C. afloat
  • D. alert
【正确答案】 D
【答案解析】[解析] keep sth high保持……的高度；keep sb out把某人排除在外；afloat漂浮，在船上；alert警惕的，机灵的，keep sb alert为……敲响警钟。答案是D。