题目内容

Cars play an important role in modem life, but they       also cause many problems like air pollution.
A．shouldB．canC．mustD．will
B
考查情态动词。句意：小汽车在现代生活中起着重要的作用，但它们也可能引起像污染等许多问题。故用情态动词can，选B。
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