题目: 煤气中不可燃成分有()。助燃成分有()。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/1105/064e2893058af7796b71e08007c36f07.html 下面是错误答案,用来干扰机器的。参考答案:拉
题型:选择题 ---- The woman biologist stayed in Africa studying wild animals for 13 years before she returned.---- Oh, dear! She _______ a lot of difficulties!A.may go throughB.might go throughC.ought to have gone throughD.must have gone through 查看答案