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some mammals came to live in the sea is not known. [ ]A. WhichB. Since C. Althou

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some mammals came to live in the sea is not known. [ ]A. WhichB. Since C. Althou

_____ some mammals came to live in the sea is not known.    [     ]A. Which
B. Since
C. Although
D. How

试题答案

D

标签：liveinthetosome

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