E－mail,as well as telephones,　　an important part in daily communication.
A．is playingB．have played
C．a(chǎn)re playingD．play
A
as well as連接主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞與其前面的名詞在人稱(chēng)和數(shù)上保持一致，因E?mail是單數(shù)，故應(yīng)排除B、C、D三項(xiàng)。
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