【題目】There are so many viruses on the Internet. If ______ accidentally, the viruses may make your computer break down.

A. downloading B. to be downloaded

C. downloaded D. being downloaded

【答案】C

【解析】

試題分析：句意：互聯(lián)網(wǎng)上有很多病毒。如果病毒不小心被下載了，那么它們會讓你的電腦崩潰。主語一致原則，后面的主語為the viruses可知前面是被下載，故選C項。

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