Question

【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

Answer 1

【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。