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We are wondering ________ we can prevent people from polluting the earth.
A.whoB.thatC.whetherD.what
C
考查引导词。句意“我们想知道我们能否阻止人们污染地球。”who“谁”;that引导宾语从句,无意义;whether“是否”;what“什么”。故选C。
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