My grandfather devoted all his time _____

试题详情及答案解析

My grandfather devoted all his time ______ poor children.

A．to help	B．helping
C．helped	D．to helping

答案：D

试题分析：句意：我的父亲把所有时间投入到帮助这些穷孩子的身上，本句中to是介词,后面接名词或者动名词做宾语, 故选D.
考点：考查非谓语动词。