only a after year -----to see the result of my experimentA.I began B.I had begun C.have I begun D.did I begin

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only a after year -----to see the result of my experimentA.I began B.I had begun C.have I begun D.did I begin
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only a after year -----to see the result of my experimentA.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
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 experimentA.I began B.I had begun C.have I begun D.did I begin
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

D after a year 一年以后,是过去时间状语,因此用过去式。 only引导的时间状语前置,句子倒装,因此选择D

应该是after a year吧。
only+状语,后面用倒装结构。
D
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