Newton was playing under an apple tree _________ an apple fell onto his head.[ ]A. whenB. whileC. af

题目简介

Newton was playing under an apple tree _________ an apple fell onto his head.[ ]A. whenB. whileC. af

题目详情

Newton was playing under an apple tree _________ an apple fell onto his head.
[     ]
A. when
B. while
C. after
D. before
题型:单选题难度:中档来源:同步题

答案

A

更多内容推荐