问题补充:
The boy seated himself in the corner with his back to his father.
A. turning
B. to turn
C. to be turned
D. turned
答案:
A. turning
B. to turn
C. to be turned
(答案→)D. turned
解析:考查非谓语动词。turnedtohisback在这里是过去分词短语作宾语补足语, 表状况turn和前面的宾语hisback为被动关系, 故用过去分词。句意:男孩坐在角落里,背对着他父亲。故D正确。