ExercisesContentsDownloadsUNIT 31: PAST PERFECTQuestion 1 / 30请完成全部题目,最后查看答案与解析GRAMMAR · A2 Exercise 1 · Exercise 1Choose the correct answer.First, I _____ a letter. Second, I showed him the letter. ⇒ I showed him a letter that I wrote _____.AwroteB'd written保存并进入下一题 →