XiJinping is the first Chinese president the Caribbean country since the two nations established diplomatic ties（建交）in 1974.
A. visited
B. visit
C. to visit
D. to be visiting
网友回答
A. visited
B. visit
(答案→)C. to visit
D. to be visiting
解析：考查不定式做定语：句意：习近平是自从1974年建交以来第一个访问加勒比国家的中国主席。当名词被序数词或the last，the next等词修饰的时候，往往用不定式做定语，选C。