If prices rise too high the government has to do something it.A. stopB. stoppedC. stoppi

问题补充：

If prices rise too high, the government has to do something it.

A. stop

B. stopped

C. stopping

D. to stop

答案：

A. stop

B. stopped

C. stopping

(答案→)D. to stop

解析：句意：如果价格涨的太高的话，政府就会采取一些措施制止它。do sth to do 做一些事情来…，不定式表示目的，故选D