On the other side of the street stand more than 180 houses are in poor condition nowA.

问题补充：

On the other side of the street stand more than 180 houses, are in poor condition now．

A. of which half

B. which half of

C. half of them

D. of them half

答案：

(答案→)A. of which half

B. which half of

C. half of them

D. of them half

解析：考查定语从句，用的是名词+of which引导的定语从句，先行词是more than 180 houses，half of which= half of more than 180 horses ，句意：在街道的另一边有180多间房子，其中一半状况很差选A。