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
(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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