单选题 He doesn't (say) in his letter (that) he' s going to (be back) (or not).
  • A. say
  • B. that
  • C. be back
  • D. or not


【正确答案】 B
【答案解析】连词用法错误，应改为whether。因为后边有or not，宾语从句应由whether引导。