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
考查時(shí)態(tài)。從句的動(dòng)作發(fā)生在謂語動(dòng)詞之前，題中謂語動(dòng)詞為took，“過去的過去”應(yīng)用過去完成時(shí)態(tài)。故選A。
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