Richardwascalledinbythepolicetoanswerquestions

问题详情：

Richard was called in by the police to answer questions ________ the disappearance of Thomas, whose relatives were so ________ his present situation.

A. concerning; concerning about                   B. concerned; concerning about

C. with regards to; concerned about               D. regarding; concerned about

【回答】

D

知识点：非谓语动词

题型：选择题