----Why do you look so tired why do you look so tired?I __a report on how to ensure the safety o

题目

----Why do you look so tired why do you look so tired?I __a report on how to ensure the safety o
miners.
A have been writng B have written

答案

A 为什么你看起来如此劳累
我一直在写.
have been doing 表示 一直在做什么事情 一直到现在 强调进行中 还在进行所以很累
have done 是已经做完了 强调完成 完成了,不知道具体什么时候完成的 也许休息好了