We can infer that the plumbing ______ at that time.
A. cost little
B. was more expensive than a water system
C. was too expensive for every family to afford
D. was not necessary
正确答案：C
55．答案为C根据第三段第二句Butthatdependedonwhethertherewasawatersystemwheretheylivedandonwhethertheycouldaffordtheplumbing
