as though用法she stood there still as though _______（turn）to a

as though用法
she stood there still as though _______（turn）to a stone.
她站在那里好像面对着一块石头.
这里用turning还是turned还是别的.
Waiting for her husband to come back,the middle-aged woman stood there still as though _____to a stone.原题是这个。
A.turning B.turned C.to turn D.turns