The reform of the Family Plan and the outcome will cause will have a great influence on yo

问题补充：

The reform of the Family Plan and the outcome will cause will have a great influence on young couples．

A. they

B. it

C. which

D. what

答案：

A. they

(答案→)B. it

C. which

D. what

解析： 句意：计划生育的改革和它带来的后果将会导致对年轻夫妇的很大的影响。这里的主语是The reform of the Family Plan and the outcome，outcome后面是定语从句，定语从句中缺少主语，outcome，用it代指前面的同类同物，they指代复数，which引导定语从句，但是定语从句中缺少主语和宾语，what不能引导定语从句，所以选B。