问题补充：
The murderer was brought in, with his hands behind his back.
A. to be tied
B. being tied
C. tied
D. having tied
答案：
A. to be tied
B. being tied
(答案→)C. tied
D. having tied
解析：本题又是一道独立主格结构中的省略考查。同样的方法，将原句恢复：“with hands（where were）tied behind his back．”
