28. The officer was very concerned the latest development in the case because he was concerned it.
A. about; in
B. for; about
C. with; for
D. in; with
网友回答
(答案→)A. about; in
B. for; about
C. with; for
D. in; with
解析：
28．A(解析：考查介词。be concerned about“关心”．be concerned in “涉及，与……有关”。选A。)