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英语单选题________ abroad so often,he can speak English very well

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英语单选题
________ abroad so often,he can speak English very well.
a.Being b.Been
c.Having been d.Had been
对这种题一直很迷茫,
以及下面这一道题
________ lunch,the finance committee resumed the meeting.
a.Having to eat b.Have to eat
c.Having eaten d.Having eat
CC
1.可以还原成Because he has been abroad so often,...然后再把它化解成分词短语,就可以了,值得注意的是句子的主语与分词短语的逻辑主语是同一个主语.
2.中包含一个独立主格结构作表示时间的状语,其逻辑主语与句子主语不是同一个,可以改写为After they ate lunch,the finance committee resumed the meeting.