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搜尋:bauxite

78. At present production levels, _________ deposits of bauxite can provide the world with aluminum for hundreds of years. 

(A) known 

(B) known are 

(C) they are known 

(D) what is known
編輯私有筆記及自訂標籤
答案:A
難度:困難

10
 【站僕】摩檸Morning:有沒有達人來解釋一下?
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