Only after Mary read her position the second time the spelling mistake.
(2012·天津，6)
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：A
解析 句意为：只有当玛丽再次读她的作文之后她才注意到这个拼写错误。“only＋状语/状语从句”位于句首时，主句须用倒装语序。after引导的是时间状语从句，接在only之后，位于句首，所以主句要用倒装，可排除B、D两项。而且根据语境知read和notice都是过去发生的动作，所以答案为A项。