Only after Mary read her position the second time the spelling mistake.
A. she noticed
B. she has noticed
C. did she notice
D. does she notice
网友回答
A. she noticed
B. she has noticed
(答案→)C. did she notice
D. does she notice
解析：考查Only引导的部分倒装。Only的倒装有两个条件：only放在句首；且强调的是状语。本题中only放在了句首，强调的是时间状语从句after Mary read her position the second time;所以后面使用倒装句的形式；句意：只有在Mary第二空读了她的作文以后，她才注意到那个拼写错误。根据上文的read说明本句使用过去时。故C正确，