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In the coming years, the building of a renewable, – - -, society based on the concepts of recycling and zero-emissions will become a crucial issue.

(1) the cyclical
(2) it is cyclical
(3) or cyclical
(4) is cyclical

Source:http://sabrd.alc.co.jp/toefl/grammar/index.html
wakuover 3 years ago
accuracy rate:60 %
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