Question

The river has become much ______ than before because of the waste water from the factories.
A. dirty    B. dirtier  C. Dirtiest

Answer 1

B

試題分析：句意：由于來自工廠的廢水，這條河變得比以前更臟了。句中暗含現在的河與以前的河相比較，所以應用比較級。故選B。