问题
选择题
The water companies were instructed to keep the people ______ to the polluted water.
A．from exposing
B．being exposed
C．exposing
D．from being exposed
答案
答案：D
这题考察词组：keep sb from doing“阻止某人做”，这里的from不能省略，另外be exposed to“暴露于”，句意是：水厂被指示不能让人们接触到污染的水。选D。