Only after Mary read her essay the second time the spelling mistake.
A. did she notice.
B. she notice.
C. does she notice
D. she has noticed
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(答案→)A. did she notice.
B. she notice.
C. does she notice
D. she has noticed
解析：考查Only引导的部分倒装。句意：只有当玛丽第二次读了文章，她才注意到拼写错误。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；根据上文的read说明本句使用过去时。故A正确。