单选题 It's (high) time they (begin) to take you seriously (and) they know (it).
  • A. high
  • B. begin
  • C. and
  • D. it


【正确答案】 B
【答案解析】[分析] “it's time+从句”句型中，从句中要用一般过去时表示虚拟语气。改“begin”为“began”。