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We are wondering ________ we can prevent people from polluting the earth.
A．whoB．thatC．whetherD．what
C
考查引導詞。句意“我們想知道我們能否阻止人們污染地球。”who“誰”；that引導賓語從句，無意義；whether“是否”；what“什么”。故選C。
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