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

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

选项 A、had done
B、did
C、would do
D、were doing

答案A

解析 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。
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