This is the best way I could think of people getting into the dangerous areas.
A. stopping
B. to keep
C. to stop
D. keeping
网友回答
A. stopping
B. to keep
(答案→)C. to stop
D. keeping
解析：考查非谓语动词。句意：这是我能想到的最好的办法来阻止人们进入危险地区。不定式做状语表示具体的将要进行的动过，keep是维持的意思，故选C。