中文谷Newtonwasplayingunderanappletree
- 习题库
- 关注：1.63W次
问题详情：
Newton was playing under an apple tree____ an apple fell onto his head.
A. while B. when C. before
【回答】
B
知识点：连词
题型：选择题
标签：
- 文章版权属于文章作者所有，转载请注明 https://zhongwengu.com/exercises/g2p5e2.html
