Thanks to the joint efforts made by the leaders of China and the US over recent years, mutually _______ Sino-US relations have made remarkable progress.

A. adaptableB. beneficial

C. relevantD. convenient

 

B

【解析】

B 句意：由于近年來中美兩國領(lǐng)導(dǎo)人的共同努力，雙邊互惠的中美關(guān)系取得了長足的發(fā)展。beneficial意為“有益的”，符合句意。adaptable有適應(yīng)能力的；relevant相關(guān)的；convenient方便的。

 

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