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    16、The town’s drinking-water _____ with prim chemicals at present.

    A. contaminates     B. is contaminated     C. is being contaminated    D. has been contaminated

    16、C

    解析：“这城市的饮用水目前正受到有毒化学药品的污染。”drinking-water与contaminate之间存在被动关系，由at present可知应用进行时的被动式，

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