Now one of the most serious problems many people are worried about on the lack of adequate housing space.
A. insists
B. depends
C. agrees
D. focuses
网友回答
A. insists
B. depends
C. agrees
(答案→)D. focuses
解析：考查动词：这些动词都可以和on搭配，A. insists坚持，B. depends 依赖 C. agrees同意 D. focuses专注，句意：现在很多人担心的最严重的问题重点在房屋空间缺少上。选D。