E-mail as well as telephones () more and more popular in daily communication.
选项
A:have become
B:become
C:are becoming
D:is becoming
出自:英语语法

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块