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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

答案：A
難度： 困難
最佳解!
pretest 高三下 (2017/05/12)
At present productio☆ ☆☆☆☆☆☆, ...


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78. At present production levels, ______..-阿摩線上測驗