The old man is very healthy. I think he will live.A. to be 100 years oldB. 100 years oldC.

The old man is very healthy. I think he will live .
A. to be 100 years old
B. 100 years old
C. at 100 years old
D. in 100 years old

(答案→)A. to be 100 years oldB. 100 years oldC. at 100 years oldD. in 100 years old解析：句意：这个老人非常健康。我认为他会活到100岁。动词不定式做状语表示具体的将要进行的动作，结合语境可知选A。

就是这个解释

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