【答案】Christianity has become a worldwide religion since it ____about two thousand years ago.

Christianity has become a worldwide religion since it ____about two thousand years ago.

A. has begin B. begins C. began D. begin

【答案】

C

【解析】

句意：从大约两千年以前基督教开始至今，它已经变成了一个世界性的宗教。A. has begin表达错误，begin应该改为begun；B. begins一般现在时的三单形式；C. began一般过去时；D. begin动词原形，一般现在时。根据since引导的从句中的时间状语about two thousand years ago判断，从句的时态为一般过去时，故答案选C。