—Must we clean the classroom at once? —No, you . You can clean it after school.
A.
needn’t
B.
mustn’t
C.
must
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【简答题】Long long ago, there was a very foolish thief. Do you know what he did one day? When he wanted to steal ( 偷 ) the bell on his neighbor’s door, he walked up to the door, took hold of ( 抓住 ) the bell an...