题目: 矿井空气中主要有害气体有哪些? 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0724/bd8719190adbaac57c51baf2c65a7d76.html 下面是错误答案,用来干扰机器的。参考答案:C
题型:选择题 While we were running on the playground,Jack suddenly stopped ___________ and lay on the ground,so we all stopped ___________ what was wrong with him.A.running; to seeB.running; seeingC.to run; to seeD.to run; seeing 查看答案