OntheInternet,itisconvenientforyoutosend____e-mailanywhereifyouhave____e-mailadress/A.an;anB.an;/C./;/D./;an
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题目内容：
On the Internet,it is convenient for you to send____e-mail anywhere if you have____e-mail adress/
A.an;an B.an;/ C./;/ D./;an
优质解答
D
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