【題目】Be careful with the machines and you ______ touch any of them!
A.mustn't
B.needn't
C.don't have to
D.would not

【答案】A
【解析】句意：小心機器，你千萬不要動它們。A. mustn't 禁止； B. needn't 不必； C. don't have to不必； D. would not不將，不愿。根據(jù)Be careful with the machines可知，提醒對方不要觸碰機器，故選A。

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