问题标题：
1.Onlyafterayear()toseetheresultofmyexperiment.A.IbeganB.IhadbegunC.haveIbegunD.didIbegin2.()inthefieldsfortwohours,theytookarest.A.HavingworkedB.WorkingC.WorkedD.Beingworked为什么
问题描述：
1.Onlyafterayear()toseetheresultofmyexperiment.
A.Ibegan
B.Ihadbegun
C.haveIbegun
D.didIbegin
2.()inthefieldsfortwohours,theytookarest.
A.Havingworked
B.Working
C.Worked
D.Beingworked
为什么
崔桂梅回答：
1.Onlyafterayear(D)toseetheresultofmyexperiment.(onlyafterayear时间状语在句首,句子倒装)
A.Ibegan
B.Ihadbegun
C.haveIbegun
D.didIbegin
2.(A)inthefieldsfortwohours,theytookarest.（非谓语动词作状语,动作发生在主句动作之前,用havingdone的结构）
A.Havingworked
B.Working
C.Worked
D.Beingworked
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