问题
选择题
The town’s drinking-water _____ with prim chemicals at present.
A．contaminates
B．is contaminated
C．is being contaminated
D．has been contaminated
答案
答案：C
“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，