问题
About_____ of the earth__ __covered with water, but we have less and less available fresh water.
A:three-fourth, is
B:three-fourths, is
C:three-fourth, are
D:three-fourths, are;
B:three-fourths, is
C:three-fourth, are
D:three-fourths, are;
正确答案是：
同类题型
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