题目内容

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

分析 这里水变得又脏又黑．已经不能继续安全饮用了．

解答 答案：B．
结合句意是说水不能饮用了，也就是水变脏的动作发生在过去，对现在造成一定的影响，用现在完成时have/has+过去分词，主语the water不可数名词，故has，become 的过去分词become，故答案是B．

点评 现在完成时指的是过去发生或已经完成的动作对现在造成的影响或结果，或从过去已经开始，持续到现在的动作或状态．

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