問題詳情

4.Trilobites, a group of spineless animals, flourished in the oceans for several hundred million years ______ some 200 million years ago.
(A)until they became extinct
(B)and their extinction
(C)that were extinct
(D)because their extinction

參考答案

答案：A
難度：簡單0.751445
統計：A(130),B(1),C(23),D(4),E(0)

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Trilobites三葉蟲 flourish1. （植物等）茂盛，繁茂This type of plant flourishes in hot countries. 這種植物在熱帶國家生長茂盛。2. （事業等）繁榮，興旺His business is flourishing. 他的生意興隆。