People in the west makea rule to buy Christmas presents for their relatives and friends.A.

问题补充：

People in the west makea rule to buy Christmas presents for their relatives and friends.

A. that

B. the thing

C. this

D. it

答案：

A. that

B. the thing

C. this

(答案→)D. it

解析：考查固定句型：make it+名词+to do sth，it是形式主语，不定式是真正的主语，句意是：西方的人给亲戚朋友买圣诞礼物已经成了规定。选D。