Russia’s cutting off the gas supply raised a major concern to the European Union, ______ a number of member states are increasingly dependent on one single supplier.
A．whoseB．thatC．whereD．which
C

試題分析：句意：俄羅斯減少供給天然氣供應(yīng)使歐盟十分關(guān)注 ，而歐盟許多成員國對單一的供給的依賴正在增加。在定語從句中主謂賓完整，所以不選關(guān)系代詞。故選C。
考點: 考查定語從句的關(guān)系詞的用法。
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