题目内容

—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’tD．mustn’t
D

试题分析：句意：孩子，你千万别在公共汽车行驶时把头伸出窗外，那很危险。对不起，我不那样做了。A. needn’t不必B. oughtn’t不应该C. couldn’t不能，过去式D. mustn’t一定不要，千万别，表示禁止。根据句意，故选D。
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