题文
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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