单选题 No sooner (had) the hikers (set out) on their trip (as) it began to rain (heavily).
  • A. had
  • B. set out
  • C. as
  • D. heavily


【正确答案】 C
【答案解析】[分析] no sooner...than是固定用法，表示“一……就……”。改“as”为“than”。