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【题目】-How long has the United Nations __________?

-__________1945.

A. come into existence; In

B. been in existence; Since

C. been in existence; From

D. come into existence; For

【答案】B

【解析】句意:——联合国成立多长时间了?——从1945开始至今。be in existence存在,强调状态;come into existence存在,强调动作;since自……以来。

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