The old sick lady entered the hospital her two sons.A. to supportB. supporting 　C. suppo

问题补充：

The old sick lady entered the hospital, her two sons.

A. to support

B. supporting

C. supported by

D. having supported

答案：

A. to support

B. supporting

(答案→)C. supported by

D. having supported

解析：考察非谓语动词.句意:这位生病的老妪在两个儿子的搀扶下进了医院.过去分词表示被动的发生过的动作,和句子主语是动宾关系,结合语境可知选C.