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    精英家教网 > 初中英语 > 题目详情

    ________ trees must be planted every year．


    1. A.
      Thousands of
    2. B.
      Thousand of
    3. C.
      Thousands
    4. D.
      Thousand
    A
    解析：
    表示一个具体数字时，thousand一词不加s，也不与of连用，首先排除B和D．表示一个不确定的数字时，thousand后要加s，也要与介词of连用，意思是“数千的”，故选A．
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