单选题
Medical doctors sometimes can make mistakes that will cost______.
A、
patients of their lives
B、
patient lives
C、
patients' lives
D、
patients their lives
【正确答案】
C
【答案解析】
解析：句意：医生有时会犯让病人致命的错误。考查词语cost的用法。cost sth．“以……为代价”。
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