问题
选择题
The situation is getting worse. We must __________ the trouble _____________.
A．keep; spreading
B．prevent; spreading
C．stop; to spread
D．protect; to spread
答案
答案：B
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。