The time he has devoted __the disabled is now considered __of gread value

The time he has devoted __the disabled is now considered __of gread value

题目
The time he has devoted __the disabled is now considered __of gread value
选项 a.to help,being b.to helping,to be c.help,to be
d.helping,being
答案
a.to help
另外 gread value 应该是 great value
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