Not only he but also his parents China for two years .A. have been inB. has been inC. has

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(答案→)A. have been in
B. has been in
C. has e to
D. have e to
解析：根据后文的时间状语内容for two years，判断时态为现在完成时，同时动词应该为延续性动词，只有答案为A。