About 71% of the earth’s surface covered with water but 20% of the world population hav

问题补充：

About 71% of the earth’s surface covered with water, but 20% of the world population have access to safe drinking water.

A. is; doesn’t

B. are; don’t

C. are; doesn’t

D. is; don’t

答案：

A. is; doesn’t

B. are; don’t

C. are; doesn’t

(答案→)D. is; don’t

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