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the answer is B,tell my why

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the answer is B,tell my why
to my satisfaction,i noticed that their work_____
B was being improved D had being improved
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
the answer is B,tell my why the answer is B,tell me why the answer is B,tell me why.thanks the answer is B,tell me why please the answer is A,tell me why the answer is A ,tell me why why not use B or C who can tell me why the right answer is the answer is A,tell me why and translate it the answer is A ,tell me why and translate it the answer is D,tell me why ,thanks Why the answer is the answer is A,tellme why ,why not use B