The successful spread of a virus depends on how long it can （） unnoticed, before its presence is made known by the activation of side-effects. For example, many viruses （） their code to avoid recognition.

For example, many viruses （） their code to avoid recognition.

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The successful spread of a virus depends on how long it can （） unnoticed, before its presence is made known by the activation of side-effects. For example, many viruses （） their code to avoid recognition.

For example, many viruses （） their code to avoid recognition.
A.interpret
B.open
C.decrypt
D.encrypt

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