The time he has devoted to helping the disabled _____ of great valueA. considers to be B. has considered C. is considered D. is considered being

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The time he has devoted to helping the disabled _____ of great valueA. considers to be    B. has considered  C. is considered    D. is considered being

The time he has devoted to helping the disabled _____ of great valueA. considers to be B. has considered C. is considered D. is considered being
The time he has devoted to helping the disabled _____ of great value
A. considers to be B. has considered C. is considered


D. is considered being

The time he has devoted to helping the disabled _____ of great valueA. considers to be B. has considered C. is considered D. is considered being
C.is considered
他致力于帮助残疾人的那段时间【被认为是】很有价值的
从句意可见,此句谓语应该用被动式,排除A,B
在【主语(sb/ sth) is considered/ said/ reported.)+ 不定式】这个句型中,后面只能接不定式,不能接分词,故排除D