【題目】-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：——聯(lián)合國成立多長時間了？——從1945開始至今。be in existence存在，強調(diào)狀態(tài)；come into existence存在，強調(diào)動作；since自……以來。

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