Before you resign you should consider the effect will have on your family.A. itB. oneC. w

问题补充：

Before you resign you should consider the effect will have on your family.

A. it

B. one

C. who

D. what

答案：

(答案→)A. it

B. one

C. who

D. what

解析：句意：在你辞职之前你应该考虑给你的家庭带来的影响。what不能引导定语从句；这里是have effect on对……的影响；先行词是effect，故排除C；关系词that或which在从句中作have的宾语，在这里省略了，it指的是辞职这件事，根据句意故选A。