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【单选题】
下面对产生计算机病毒的原因,不正确的说法是A.
为了破坏别人的系统，有意编写的破坏程序
B.
为了惩罚盜版，有意在自己的软件中添加了恶意的破坏程序
C.
为了表现自己的才能，而编写的恶意程序
D.
有人在编写程序时，由于疏隊而产生了不可预测的后果
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皮皮学刷刷变学霸
举一反三
【单选题】Have you worked there long?
A.
Yes, I have worked there for more than fifteen years.
B.
I am bored.
C.
I like my job very much.
D.
I don't know.
【简答题】As you worked late yesterday, you ______ have come this morning. A. needn’t B. mayn’t C. can’t D. mustn’t
【单选题】As you worked late yesterday,you_________have
A.
19. As you worked late yesterday,you_________have comethis morning. ( 全国 2) A.mayn’t
B.
can’t
C.
mustn’t
D.
needn’t
【简答题】It is necessary for you to have worked in this sector before.
【单选题】—Have you worked here since you graduated? —No, I ____________at a factory in Beijing for six years.
A.
would work
B.
have worked
C.
had worked
D.
worked
【单选题】( ) you have worked out the hard problem, you shall have a rest first.
A.
By now
B.
Ever since
C.
Now that
D.
In that
【简答题】学生注意转移快慢的标志是速度，速度受哪些方面的因素影响?
【简答题】If you have worked hard all day, you feel like this. t______
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