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
考查情態(tài)動(dòng)詞。這里的肯定句表示“有時(shí)會，可能會”，用can。注意can與must都能用于肯定句中表示肯定的推測與判斷，表示具體情形的推測判斷用must，而can表示一般性的敘述，“有時(shí)會”。
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