单选题 The guards ______ to see her I. D. before they allowed her in the building.
  • [A] demand
  • [B] demanded
  • [C] had demanded
  • [D] will demand


【正确答案】 B
【答案解析】[精析] 本题中用的是过去时态，检查身份证发生在进楼前，时间在过去的过去，而C为现在完成时，A为一般现在时，D为一般将来时，只有B为一般过去时。故选B。