When he came to he found himself on a chair with his hands back.A. to sit; tyingB. si

问题补充：

When he came to, he found himself on a chair, with his hands back.

A. to sit; tying

B. sitting; tying

C. seating; tied

D. seated; tied

答案：

A. to sit; tying

B. sitting; tying

C. seating; tied

(答案→)D. seated; tied

解析：由seat的用法(be seated)可知第一空应用seated作宾语补足语；with his hands tied back为with的复合结构在句中作伴随状语。