单选题 We recognized his voice ______ he spoke on the radio.
  • [A] while
  • [B] after
  • [C] in case
  • [D] the moment


【正确答案】 D
【答案解析】[考点] 固定短语
[解析] the moment(that)表示“一……就……”，与as soon as有相同用法。