I'm tired out. I_____ all afternoon and

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问题选择题

I'm tired out. I _____ all afternoon and I don't seem to have finished anything.

A. have been shopping
B. shopped
C. have shopped
D. had shopped

答案

答案：A

选择题

– I think teenagers should be allowed to meet internet friends alone.

– ________. It’s not safe enough.

A. I disagree B. I think so C. I agree

单项选择题

计算机能自动完成用户提交的任务，其基础是（）

A、计算机具有CPU

B、计算机使用电能

C、计算机使用存储程序控制原理

D、计算机系统由硬件系统和软件系统组成