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
It took me a long time before I was able to fully appreciate what they __ for me.
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
A.had done
B.did
C.would do
D.were doing
寻详解
英语人气：926 ℃时间：2019-10-11 20:27:20
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