— You should be careful when ________.
— Yes, I will. I’d like to know when ________ to have a rest.
| A．driving; stopping | B．driving; to stop |
| C．to drive; stopping | D．to drive; to stop |
— You should be careful when ________.
— Yes, I will. I’d like to know when ________ to have a rest.
| A．driving; stopping | B．driving; to stop |
| C．to drive; stopping | D．to drive; to stop |
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