Every possible means ________ to prevent water pollution, but we still have not enough clean water．
- A.
has been used
- B.
are used
- C.
were used
- D.
have been used
A
考查時(shí)態(tài)和主謂一致。means前有every修飾，謂語(yǔ)動(dòng)詞只能用單數(shù)，且根據(jù)語(yǔ)境we still have not enough clean water可知到現(xiàn)在為止我們已經(jīng)使用了每一種可能的方法，故選A。
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