The new law would come into on the day it was passed. A. effect　　B. use　　C. service 　D. ex

问题补充：

The new law would come into on the day it was passed.

A. effect

B. use

C. service

D. existence

答案：

(答案→)A. effect

B. use

C. service

D. existence

解析：考查短语：come into effect开始生效，句意：新法律会在通过的那天开始生效。come into use开始使用，come into service开始服务，come into existence开始存在。

根据句意所以选A。