题目内容

Tom's mother kept telling him that he should work harder, but ______ didn't work.

A. he
B. it
C. which

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I don't know______.

A. to go there with whom
B. whom to go there
C. whom to go there with

要抓下当前屏幕显示的、任意的全屏图像，具体方法是：______。

A. 按PrtScrn键
B. 按Alt+PrtScrn键
C. 按Ctrl+C键
D. 按Ctrl+V键

When teenagers have something difficult to say to their parents, they usually stay alone at home.

A. Right.
B. Wrong.
C. Doesn't say.

计算机病毒是一段程序，以下______不是病毒的特征。

A. 破坏性
B. 传播性
C. 无规律性
D. 潜伏性