D.did I begin
after a year 是一般過去時(shí)的時(shí)間狀語,由only修飾放在句首,主句倒裝為什么不是hadafter a year 是一般過去時(shí)的時(shí)間狀語，原句是I began to see ...after a year./ 不能用過去完成時(shí)又如He came back after a year (a year later )
only a after year -----to see the result of my experiment
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
A.I began
B.I had begun
C.have I begun
D.did I begin
英語人氣：989 ℃時(shí)間：2020-01-29 20:29:02
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