—We _______ keep quiet in the library.
—Yes, I agree with you. And we _________ bring our student cards every time.
| A．must； mustn’t | B．have to； mustn’t |
| C．must； don’t have to | D．have to； don’t have to |
—We _______ keep quiet in the library.
—Yes, I agree with you. And we _________ bring our student cards every time.
| A．must； mustn’t | B．have to； mustn’t |
| C．must； don’t have to | D．have to； don’t have to |
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