【題目】We have done much to protect the environment. So the river is getting than before.

A. dirtier B. dirty C. cleaner D. clean

【答案】C

【解析】

試題分析:句意:我們已經(jīng)做了許多去保護(hù)環(huán)境。所以河流現(xiàn)在比以前變得更干凈了。A. dirtier更臟,形容詞的比較級(jí); B. dirty臟的,原級(jí); C. cleaner更干凈,比較級(jí); D. clean 干凈的,原級(jí)。than比,用于兩者比較,所以用比較級(jí),根據(jù)上句已經(jīng)做了許多保護(hù)環(huán)境的事情,可知河流更干凈,故選C。

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