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We talk loudly when we see the sign “Be quiet on the wall. A. must B. mustn’t C. need D. needn’t 【查看更多】

 

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We _______ talk loudly when we see the sign "Be quiet" on the wall.
[     ]
A. must
B. mustn't
C. need
D. needn't

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—We ______ talk loudly when we see the sign "Be quiet" on the wall.
—Yes, you are right.  We should be polite in public.
[     ]
A. must
B. mustn't
C. need
D. needn't

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We ________ talk loudly when we see the sign“Be quiet”on the wall．

[　　]

A．must

B．mustn’t

C．need

D．needn’t

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