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    精英家教网 > 高中英语 > 题目详情
    Cars play an important role in modern life, but they ______ also cause many problems like air pollution.
    A．shouldB．canC．mustD．will
    B
    考查情态动词的用法。should应该，can有时候可能会，must必须，will将会，句意：汽车在相待生活中起着非常重要的作用，但是，他们有时候可能也会引起许多为题像空气污染。故选B。
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