The town’s drinking-water _____ with prim chemicals at present.
A．contaminatesB．is contaminated
C．is being contaminatedD．has been contaminated
C
“這城市的飲用水目前正受到有毒化學(xué)藥品的污染�！眃rinking-water與contaminate之間存在被動(dòng)關(guān)系，由at present可知應(yīng)用進(jìn)行時(shí)的被動(dòng)式，
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