It took me a long time before I was able to fully appreciate what they for me. A. had done B. did C. would do D. were doing [解析]:A.考查过去完成时和一般过去时的区别.整个句子时态用的是一般过去时.我能够表示感谢就已经是过去.而他们对我的帮助则是过去的过去.因此选A. 查看更多

 

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 It took me a long time before I was able to fully appreciate what they__________for me.

     A. had done      B. did        C. would do       D. were doing

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It took me a long time before I was able to fully appreciate what they __ for me.

A.had doneB.didC.would doD.were doing

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It took me a long time before I was able to fully appreciate what they __ for me.

A.had done         B.did               C.would do          D.were doing

 

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It took me a long time before I was able to fully appreciate what they ______ for me.

A.had done

B.did

C.would do

D.were doing

 

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It took me a long time before I was able to fully appreciate what they _____ for me.

A. had done   B. did    C. would do   D. were doing

 

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