—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 |