题目内容
Xiao Li was about to cheat in the exam ________ the teacher came up, smiling to him.
A. as B. when C. while D. until
B
练习册系列答案
相关题目
Xiao Li was about to cheat in the exam ________ the teacher came up, smiling to him.
| A．as | B．when | C．while | D．until |