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Alittleunderamillionyearsago,thebrinywatersoftheBalticSeabeganfloodingintothecoldNorthAtlantic:geologistsarestilldebatingwhetherthefloodwasgradualorcreatedacataclysm.（）
(A)whetherthefloodwasgradualorcreatedacataclysm
(B)ifthefloodwasgradualorcreatedacataclysm
(C)aboutwhetherthefloodwasgradualorcataclysmic
(D)whetherthefloodwasgradualorcataclysmic
(E)whetherthefloodwasgradualoritcreatedacataclysm

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