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    Cars play an important role in modern life, but they_______also cause many problems like air pollution．
    A．should B．can C．must D．Will
    B
    考查情态动词。这里的肯定句表示“有时会，可能会”，用can。注意can与must都能用于肯定句中表示肯定的推测与判断，表示具体情形的推测判断用must，而can表示一般性的叙述，“有时会”。
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