V-ed和having been v-ed的区别

V-ed和having been v-ed的区别

题目
V-ed和having been v-ed的区别
when completed ,the museum will be open to the public next year.
中的completed能用having been compled 互换吗?
它们都是表示过去被动吧.
答案
completed is correct.
having been done means a thing keep happening from a moment in the past to now.
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