Sincehedownloadedavirusintohis

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Since he downloaded a virus ________ into his computer, he can’t open the file now.

A．by design

B．by accident

C．on purpose

D．by mistake

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相关试题

______ has helped to save the drowning girl is worth praising.

A．Who

B．The one

C．Anyone

D．whoever

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Although the working mother is very busy, she still ______ a lot of time to her children.

A．devotes

B．spends

C．offers

D．provides

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When you are learning a foreign language, _______, you must forget your own language.

A．at the first

B．first of all

C．in first

D．first at all

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Great changes _______ in the city, and a lot of factories _______.

A．have been taken place; have been set up	B．have taken place; have been set up
C．have taken place; have set up	D．were taken place; were set up

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---How often do you go home?
---________.

A．For three weeks

B．Three weeks ago

C．Every three weeks

D．In three week’s time

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