↑ 收起筛选 ↑
试题详情

This was not an easy task. The reason1.this was difficult was that the team had limited resources. They did not have enough staff, and the laboratory in which they 2.(work)had poor air quality. However, after hundreds of failed experiments, they eventually came across a promising chemical. It worked well in experiments on animals,3.they had to know if it was safe for humans. Tu Youyou bravely volunteered to be the first human subject when they were ready to start testing and the rest of her team followed her.

高一英语语法填空中等难度题

少年,再来一题如何?
试题答案
试题解析
相关试题