问题补充：
—The former president of Iraq was caught at last.
—Really? Where himself?
A. has he hidden
B. had he hidden
C. was he hidden
D. has he been hidden
答案：
A. has he hidden
(答案→)B. had he hidden
C. was he hidden
D. has he been hidden
解析：hide动作发生在caught之前，故用过去完成时。B项为最佳答案。
