单选题 It worried her a bit ______ her hair was turning grey.
  • [A] while
  • [B] that
  • [C] if
  • [D] though


【正确答案】 B
【答案解析】考查连词用法。由句子主语应当能看出这里是用it作形式主语，因此应用that引出从句作真正主语。while表同时或者轻微转折，if表示假设，though表让步，这三个都明显不合句意逻辑。