两道英语选择题求原因

1. The house was very quiet,____as it was on the side of a mountain.

A.isolated B.being isolated C.having been isolated.

2.We have been told that under no circumstances____the telephone in the office for personal affairs.

A.may we use B.we may use C.did we use

A，分词作状语，

A，UNDER NO CIRCUMSTANCES这种在前用倒装，C时态不对，

1.D 由as 由于看出是完成时 已经被隔离了

2.C 是under no circumstances 否定词 的倒装句