Before you decide to leave your job, the effect it will have on your family. A. consider

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(答案→)A. consider
B. considering
C. to consider
D. considered
解析：
A，before 引导的是时间状语从句，填空句为主句，而此主句为一祈使句，故动词用原形。其中 it will have … 为修饰名词 the effect 的宾语从句。