20．The water       dark and dirty．It's no longer safe to drink．（　�。�
A．becameB．has becomeC．will becomeD．was becoming

分析 這里水變得又臟又黑．已經(jīng)不能繼續(xù)安全飲用了．

解答 答案：B．
結(jié)合句意是說水不能飲用了，也就是水變臟的動(dòng)作發(fā)生在過去，對(duì)現(xiàn)在造成一定的影響，用現(xiàn)在完成時(shí)have/has+過去分詞，主語(yǔ)the water不可數(shù)名詞，故has，become 的過去分詞become，故答案是B．

點(diǎn)評(píng) 現(xiàn)在完成時(shí)指的是過去發(fā)生或已經(jīng)完成的動(dòng)作對(duì)現(xiàn)在造成的影響或結(jié)果，或從過去已經(jīng)開始，持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài)．

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