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问题: 请教两道题!搞不懂啊??

1、The house was very quiet,_____ as it was on the side of a mountain.
A.isolated B.isolating C.being isolated D.having been isolated

2、He wasn't asked to take on the chairmanship of the society, _____ insufficiently popular with all members.
A.being considered B.considered
C.to be considered D.having considered


两道答案为均为A,为什么?搞不懂啊??

解答:

1."过去分词+as it is"是as结构的特定用法.The house was very quiet, isolated as it was on the side of a mountain.这个句子中,"as it is"(过去式用was)是强调"isolated",it 是主句中的主语,这里是"house".如果不要强调,则取消"as it is",句子就成为:"The house was very quiet, isolated on the side of a mountain".
这个结构也可以放到句首,变成:
Isolated as it was on the side of a mountain,the house was very quiet.
此题选过去分词才是唯一正确的选择.
2.本句中,他被认为不太受所有成员的欢迎,肯定"consider"用被动形式.由于要体现"consider"结构后面起原因状语作用,所以要用现代分词被动形式.