单选题 After 13 years in Chengdu, John has finally decided to ______ Chinese citizenship.
【正确答案】 B
【答案解析】本题主要考查动词短语辨析。look for意为"盼望，期待"，apply for意为 "申请，请求"，concentrate on 意为"全神贯注，专心致志（于某事物）"，appeal on意为"恳求，呼吁"。