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
A

試題分析：句意：我花費了很長的時間才能夠完全領(lǐng)會他們?yōu)槲宜龅�。句中was able to 都發(fā)生在過去的時間，而根據(jù)句意他們?yōu)槲宜龅�，�?yīng)該已經(jīng)做完了，發(fā)生在took這個動作之前，即過去的過去，故選A
點評：動詞的時態(tài)是學習英語過程中非常重要的知識。而很多的題目，句中并沒有像本題一樣有明確的時間，很多要通過上下文的判斷得知。過去完成時表示動作發(fā)生在過去的過去，本題不難，平時加強記憶，理解即可。
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