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:
isolated as it was on the side of a mountain部分可看作是which was isolated as it was on the side of a mountain这个定语从句的省略,故选A. 第二题应用being considered 这个动名词结构来引导原因状语从句being considered insufficiently popular with all members.，所以选它。
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