Only after Mary read her position the second time the spelling mistake.
A. did she notice
B. she noticed
C. does she notice
D. she has noticed
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(答案→)A. did she notice
B. she noticed
C. does she notice
D. she has noticed
解析：考查部分倒装。Only+状语从句位于句首，后面的句子部分倒装，把助动词或情态动词提前。
排除B、D两个选项。根据句意，是过去时，所以选择A选项。句意：只有在第二次读完作文
以后，玛丽才注意到了那个拼写错误。