The Nuclear Security Summit is an initiative of Mr. Obama, considers nucle
题型：不详难度：来源：
| The Nuclear Security Summit is an initiative of Mr. Obama, considers nuclear terrorism to be one of the greatest threats to international security. |
答案
| C |
解析
试题分析：句意：核安全峰会是奥巴马先生的计划,他认为核恐怖主义是对国际安全的最大威胁之一。这句话使用了定语从句，先行词是Mr. Obama，定语从句中缺少主语，用who引导定语从句，所以选C。 |
举一反三
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