A
此動(dòng)作發(fā)生在was able to之前,即表示發(fā)生在過(guò)去的過(guò)去,用過(guò)去完成時(shí)
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
尋詳解
A.had done
B.did
C.would do
D.were doing
尋詳解
英語(yǔ)人氣：483 ℃時(shí)間：2019-10-11 20:27:20
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