Some researches have proved that water quality due to too many dams and pumps in some areas.A. has been declined B. is being declinedC. is declining D. had been declining 题目和参考答案——青夏教育精英家教网—

题目内容

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

【解析】

试题分析：考查动词的时态。句意：许多研究表明，水的质量由于过度开采而下降。根据语境提到研究表明，这个问题正在发生，故用现在进行时，故选C项。

考点 : 考查动词的时态

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