Be careful when you surf the Internet．If you download a virus into your computer ______, you will not open your files．
A．on purposeB．by accidentC．a(chǎn)t randomD．on average
B
詞組辨析題。上網(wǎng)時(shí)小心些，如果你偶然下載病毒進(jìn)入你的電腦你的文件會(huì)無法打開。A．on purpose 故意          B．by accident 偶然   C．a(chǎn)t random 隨機(jī)         D．on average 平均   根據(jù)語境選B
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