If a healthy environment is gone everything that our life depends on.A. so isB. nor isC

问题补充：

If a healthy environment is gone, everything that our life depends on.

A. so is

B. nor is

C. so does

D. nor does

答案：

(答案→)A. so is

B. nor is

C. so does

D. nor does

解析：A 考察倒装句。当表示前面的肯定情况也适用于后者的时候，使用“so+助动词+主语”的结构，故A正确。