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问题 单项选择题

以下不属于入侵病毒按传染方式分类的是（）。

A.磁盘引导区传染的计算机病毒

B.操作系统传染的计算机病毒

C.一般应用程序传染的计算机病毒

D.外壳病毒

答案

参考答案：D

选择题

Robert is said _______abroad, but I don’t know country be studied in .

A. to have studied   B. to study  C. to be study   D to have been studying

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选择题

—What ______ you ____ to your teacher if you are not on time?

— I think we do the same as you do.[ ]

A. do, tell  

B. do, say  

C. will, say  

D. will, tell
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