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only a after year -----to see the result of my experiment

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only a after year -----to see the result of my experiment
A.I began
B.I had begun
C.have I begun
D.did I begin
only a after year -----to see the result of my experiment
D.did I begin
after a year 是一般过去时的时间状语,由only修饰放在句首,主句倒装
再问: 为什么不是had
再答: after a year 是一般过去时的时间状语,原句是I began to see ...after a year./ 不能用过去完成时 又如 He came back after a year (a year later )