the answer is B,tell my why
to my satisfaction,i noticed that their work_____
B was being improved D had being improved
人气：243 ℃ 时间：2020-04-30 02:57:05
解答
was being improved 表示IMPROVE 的动作当时正在进行.had being improved强调已经完成,发生在过去的过去.improve 发生在notice之前
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