The problem of air pollution is becoming more serious ______ the increasing number of cars.
A．a(chǎn)s for B．becauseC．a(chǎn)s a resultD．a(chǎn)s a result of
D
本題的含義為由于車子數(shù)量急劇增加的結(jié)果，空氣污染的問題變得更加嚴(yán)重，as a result of 表示由于……的結(jié)果的含義，故本題選D。
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