问题
单项选择题
The house was very quiet, () as it was on the side of a mountain.
A. isolated
B. being isolated
C. isolating
D. having been isolated
答案
参考答案：A
解析：
isolated as it was on the side of a mountain是as引导原因状语从句的强调表达形式，相当于as it was isolated on the side of a mountain。又如：Written as it is in an easy style, the book is suitable for beginners。