問題詳情

30 Scientific research has confirmed that two thirds of the planet’s surface ____covered with water.
(A) is
(B) are
(C) have been
(D) to be

參考答案

答案：A
難度：適中0.424242
統計：A(14),B(9),C(8),D(2),E(0)

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原本題目:30 Scientific research has confirmed that two thirds of the planet’s surface covered with water.(A) is (B) are (C) have been (D) to be修改成為30 Scientific research has confirmed that two thirds of the planet’s surface ____covered with water.(A) is (B) are (C) have been (D) to be