一起答
单选

What is the fourth boy working on in the four-person group?

  • A.He's working on a math problem with graph paper.
  • B.He's working on the idea of "200-pound explosive shells"
  • C.He's working on a war-related problem with the help of graphs.
  • D.He's working on the chemistry related problem with illustration.
参考答案
查看试卷详情