国家开放大学 / 综合英语（2）
正确率：100%
12. Christianity _ _ _ _ _ a worldwide religion since it _ _ _ _ two thousand years ago.
a.became, began
b.become, has begun
c. has become, began
d.has become, has begun
a.became, began
b.become, has begun
c. has become, began
d.has become, has begun
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