单选题 It would seem to be a general truth ______ nothing is as straightforward as it at first seems.
  • [A] that
  • [B] when
  • [C] because
  • [D] if


【正确答案】 A
【答案解析】[精析] 本题中it为形式主语，that引导的从句为后置的主语从句。