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高一英语一道单选题Email,aswellastelephone,animportantpartindailycommunication.A.isplayingB.haveplayedC.areplayingD.plays------------------------------------答案A,请问为什么不能是D?能再详细一点吗

题目详情
【高一英语】一道单选题
Email, as well as telephone,_________ an important part in daily communication.
A.is playing
B.have played
C.are playing
D.plays
------------------------------------
答案A,请问为什么不能是D?
能再详细一点吗
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答案和解析
as well as 谓语动词和前面保持一致
not only ...but also...谓语动词和后面保持一致
这里应与email保持一致