The situation is getting worse. We must the trouble .
A. keep; spreading
B. prevent; spreading
C. stop; to spread
D. protect; to spread
网友回答
A. keep; spreading
(答案→)B. prevent; spreading
C. stop; to spread
D. protect; to spread
解析：考查词组：阻止…做…keep/stop/prevent sb from doing其中除了keep以外，其他动词后面都可以省略from，所以选B，句意是：形势越来越严重，我们必须防止麻烦蔓延。