摘要： Be careful when you open an unknown document. It might contain the deadly virus which could entirely your computer system in a minute. A. break down B. crash C. block out D. dissolve

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Be careful when you open an unknown document. It might contain the deadly virus which
could entirely ______ your computer system in a minute.   
[     ]

A. break down    
B. crash    
C. block out  
D. dissolve

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Be careful when you open an unknown document. It might contain the deadly virus which could entirely ______ your computer system in a minute.

　 A. break down　 　　B. crash　 　　　　　C. block out　 　　　 D. dissolve

 

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