E-mail, as well as telephone, ______ an important part in daily communication.
A．is playing B．have played C．are playing D．played
A
考查主謂一致。本題的謂語動詞和E-mail保持一致，應該使用單數(shù)。本題沒有出現(xiàn)過去時的時間狀語，所以使用現(xiàn)在時。
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