In this district for five months or more of the year no construction can be done the ra

问题补充：

In this district for five months or more of the year, no construction can be done the rainy season makes it impossible.

A. before

B. while

C. until

D. when

答案：

A. before

B. while

C. until

(答案→)D. when

解析：考查关系副词when引导定语从句，指代five months or more of the year。