President Obama and visiting Chinese president Xi Jinping held talks on a private property, the first official meeting since the two countries changed their leadership.
A. marking
B. to mark
C. marked
D. to be marked
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(答案→)A. marking
B. to mark
C. marked
D. to be marked
解析：试题分析：句意：奥巴马总统和来访的中国国家主席习近平在私人农庄举行会谈，标志着两国自更换了领导后的第一个正式的会谈。mark v.作记号; 在…留下痕迹 marking标志着。再如，It was the first of six moments of silence, marking key moments of 911. 这是六个默哀的时刻中的第一个，标志着911的关键时刻。
考点: 考查非谓语动词的用法。