问题
选择题
| You are supposed to read your article carefully and get it polished _____ you submit it. |
A. until B. when C. before D. after |
答案
答案：C
搜题请搜索小程序“爱下问搜题”
| You are supposed to read your article carefully and get it polished _____ you submit it. |
A. until B. when C. before D. after |
答案：C
请你连接相关部分
| A．树林能保持水土 | a．生物对环境的适应 |
| B．竹节虫停息是模样像竹子 | b．生物对环境的影响 |
| C．地衣能分化岩石表面，而分化的岩石为地衣提供了更好的生存条件 | c．生物与环境是一个相互统一的整体 |
缺失，行双端固定桥修复。固定桥试戴时，用力戴入后，邻牙出现胀痛，最可能的原因是（）