In the west people make a rule to send Christmas present to their relatives and friends

问题补充：

In the west, people make a rule to send Christmas present to their relatives and friends.

A. this

B. that

C. it

D. the following

答案：

A. this

B. that

(答案→)C. it

D. the following

解析：it 为形式宾语，真正的宾语是其后的不定式 to send Christmas present to their relatives and friends。