We are wondering ________ we can prevent people from polluting the earth


  1. A.
    who
  2. B.
    that
  3. C.
    whether
  4. D.
    what
C
考查引導(dǎo)詞。句意“我們想知道我們能否阻止人們污染地球!眞ho“誰”;that引導(dǎo)賓語從句,無意義;whether“是否”;what“什么”。故選C。
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A.think of a plan
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