Once a plan should be carried out.A. makeB. makingC. madeD. to make

问题补充：

Once , a plan should be carried out.

A. make

B. making

C. made

D. to make

答案：

A. make

B. making

(答案→)C. made

D. to make

解析：考查非谓语动词。句意：一旦制定，计划就应该执行。过去分词表示被动的，发生过的动作，和句子主语是动宾关系，plan是make的对象，故选C。