【題目】____, the shower water is no longer usable until the chemicals and wastes are removed from it.
A.Considering to be polluted
B.Considering to be polluting
C.Considering to have been polluted
D.Considering to have polluted

【答案】C
【解析】句意：考慮到噴淋水已經(jīng)被污染了，因此在沒有給除去水里的化學(xué)物和污染物之前，這水是不能用的。水和污染之間是被動關(guān)系，用被動結(jié)構(gòu)，而且污染已經(jīng)是過去的事情，用完成時。所以這里的不定式要用完成時的被動形式。故選C。

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