问题
选择题
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
答案
答案：D
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。