问题描述:
they were playing on the computer__their teacher came in.A.when B.until C.while D.after
这道题选A,请问为什么不能选until或者after,如果能系统讲解更好
这道题选A,请问为什么不能选until或者after,如果能系统讲解更好
问题解答:
我来补答展开全文阅读