It makes good sense to buy a large packet because will work out cheaper in the end.
A. it
B. this
C. one
D. they
网友回答
(答案→)A. it
B. this
C. one
D. they
解析：A 考察代词。句意：买一个大包很明智，因为最终算下来大包便宜很多。It指代上文提及的同一事物，this这个；one同类不同物，泛指一个；they他们。空白处所填词应指代上文中的a large packet。故A正确。