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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
寻详解
人气:285 ℃ 时间:2019-10-11 20:27:20
解答
A
此动作发生在was able to之前,即表示发生在过去的过去,用过去完成时
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