【题目】Only after Mary read her composition the second time________the spelling mistake.
A.did she notice
B.she noticed
C.does she notice
D.she has noticed

【答案】A
【解析】句意：仅仅在Mary第二次读完作文之后，她才注意到拼写错误。only放句首，后面跟状语，主句部分要用到部分倒装。根据语境理解，此句子应该用到过去时态，将助动词did倒装放前面。句故选A。