vi.（搭乘车、船等）通勤；代偿vt.减刑；交换；用......交换；使......变成n.通勤（口语）A. crookB. conceitC. commuteD. convert

本题考查对单词词义的掌握。解题思路是需要明确每个选项单词的含义，然后与题目中给出的英文释义进行匹配。

• 选项A：“crook”常见释义为“骗子；窃贼；钩；弯曲处” ，其英文释义为“a person who is dishonest or a criminal; a curved part or shape”，与题目中“（搭乘车、船等）通勤；代偿vt.减刑；交换；用......交换；使......变成n.通勤（口语）”的释义不相符。
• 选项B：“conceit”常见释义为“自负；自满；骄傲；幻想；奇想”，英文释义为“an exaggerated opinion of one's own abilities or importance; a fanciful or ingenious idea”，和题目所给释义不一致。
• 选项C：“commute”有“（搭乘车、船等）通勤；代偿；减刑；交换；用......交换；使......变成”等意思，英文释义为“travel regularly between one's place of work or study and one's home; reduce (a prison sentence); exchange; change from one form, state, or system to another”，与题目释义完全匹配。
• 选项D：“convert”主要意思是“转变；转换；改变（信仰、观点等）；使皈依”，英文释义为“change from one form, use, or system to another; cause (someone) to change their religious or political beliefs”，和题目释义不完全一致。