单选题 ______a boy of ten, he started working to support his family.
  • [A] Being
  • [B] While
  • [C] Because of
  • [D] When still


【正确答案】 B
【答案解析】[解析] when still a boy=when he is still a boy．句意为“当还是一个10岁的小孩时，他就开始挣钱养家了。”