( )| A．You mustn’t talk in the classroom. |
| B．You mustn’t talk in the library. |
| C．You mustn’t talk in the sitting room. |
( )| A．The light is red. You can cross the street. | B．The light is red. You must cross the street. |
| C．The light is red. You mustn't cross the street. | |
( )| A．You mustn’t cross the street. |
| B．You must take the medicine. |
| C．You mustn’t talk in the library. |
| A．can | B．must | C．mustn’t |
搜索
