问题补充：
Don’t you think that the river is now?
A. much cleaner
B. very cleaner
C. much clean
D. cleanest
答案：
(答案→)A. much cleaner
B. very cleaner
C. much clean
D. cleanest
解析：在比较级前常用 much (….得多) , even (甚至), still (更), a little (一点)，a bit (有点)等来修饰形容词，表示“程度进一步加深”。 very, so, too, quite, rather 等程度副词，一般只能修饰形容词的原级，不能修饰比较级形式。句意:你认为这条河现在更干净了吗?结合语境可知选A.
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