题目内容

There ______ be something wrong with your computer.

A. have to
B. has to
C. should
D. must

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You ______ smoke in class.

A. don’t have to
B. must
C. mustn’t
D. have to

If you want to study abroad, you ______ learn English well.

A. must
B. have to
C. don’t have to
D. mustn’t

( )是自动气象站设备管理、使用、维修等各项工作的基础。

A. 安装
B. 软件操作
C. 常规维护
D. 故障处理

值班员应于每日21时检查数据采集器的时钟与北京时间相差是否保持在30s之内。( )

A. 对
B. 错