—Boy, you _______ lean (伸) out of the window while the bus is running. That’s dangerous.
—Sorry, I won’t do that again.
| A．needn’t | B．oughtn’t |
| C．couldn’t | D．mustn’t |
—Boy, you _______ lean (伸) out of the window while the bus is running. That’s dangerous.
—Sorry, I won’t do that again.
| A．needn’t | B．oughtn’t |
| C．couldn’t | D．mustn’t |
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