according to a recent study,animals in the wild have life spans------their relatives in zoosa twice those or more of b twice that or more of c that twice or of more d that twice or more of选哪个 为什么

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according to a recent study,animals in the wild have life spans------their relatives in zoos
a twice those or more of b twice that or more of
c that twice or of more d that twice or more of
选哪个 为什么

d
凭语感猜出来的,

According to a recent study,animals in the wild have life spans---A---their relatives in zoos
a twice those or more of b twice that or more of
c that twice or of more d that twice or more of