問題詳情

21. While nearly 70 percent of the world is covered by water, only 2.5 percent of ________ is fresh.
(A)it
(B)them
(C) those
(D) which

參考答案

答案:A
難度:非常困難0.166667
統計:A(1),B(0),C(3),D(2),E(0)

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