Some researches have proved that water quality ____ due to too many dams and pumps in some areas.

A. has been declined B. is being declined

C. is declining D. had been declining

 

C

【解析】

試題分析：考查動詞的時態(tài)。句意： 許多研究表明，水的質(zhì)量由于過度開采而下降。根據(jù)語境提到研究表明，這個問題正在發(fā)生，故用現(xiàn)在進(jìn)行時，故選C項(xiàng)。

考點(diǎn) : 考查動詞的時態(tài)

 

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