Cars play an important role in modem life, but they       also cause many problems like air pollution.
A．shouldB．canC．mustD．will
B
考查情態(tài)動詞。句意：小汽車在現(xiàn)代生活中起著重要的作用，但它們也可能引起像污染等許多問題。故用情態(tài)動詞can，選B。
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