单选题:What is a "benign" virus?

题目内容:
What is a "benign" virus? A.It is a virus that causes great damage.
B.It is a virus that once infected the IBM' s computer system.
C.It is a virus that carries a Christmas greeting.
D.It is a virus that causes no harm to the computer systems.

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Why does the woman like the brick house better than the white house? A.It is big

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