TherearesomanyvirusesontheInte

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

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B．advertised

C．advertise

D．advertising

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A．Seeing; frightened	B．Seeing; frightening
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A．Mary was chosen	B．Mary chosen
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B．taking

C．took

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A．to have played

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