E-mail, as well as telephones, _______an important part in daily

E-mail, as well as telephones, _______an important part in daily communication.
A、is playing
B、have played
C、are playing
D、play
【正确答案】：A
【题目解析】：as well as连接主语时，谓语动词与其前面的名词在人称和数上保持一致，因Email是单数，故应排除B、C、D三项。