问题
单项选择题
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
答案
参考答案：A
解析：[分析] 结构识别 逗号后面的部分是原因状语从句as it was isolated on the side of a mountain，本句为了强调“被隔绝”之意，将isolated提前；因此A为答案。