The Nuclear Security Summit is an initiative of Mr. Obama, considers nuclear terrorism to be one of the greatest threats to international security.

A. which B. what C. who D. whom

 

C

【解析】

試題分析：句意：核安全峰會是奧巴馬先生的計(jì)劃,他認(rèn)為核恐怖主義是對國際安全的最大威脅之一。這句話使用了定語從句，先行詞是Mr. Obama，定語從句中缺少主語，用who引導(dǎo)定語從句，所以選C。

考點(diǎn)：考查定語從句

 

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