问题描述：
having been +V-ed 和v-ed做状语的区别
Not having completed the programme,they have to stay there for another two weeks.
when completed ,the museum will be open to the public next year.
这里的completed 和having completed 可以互换吗?
都是表被动完成吧?
Not having completed the programme,they have to stay there for another two weeks.
when completed ,the museum will be open to the public next year.
这里的completed 和having completed 可以互换吗?
都是表被动完成吧?
问题解答：
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