_______ of the earth is covered by water.
举一反三
- Three-fourths of the surface of the earth ______ covered with water.
- Three-fourths of the surface of the earth ______ covered with water.
- 75% of the Earth's surface is covered with water.
- Two-thirds of the earth's surface (be) ______ covered with water.
- Seventy-five percent of the surface of the earth （） by water. A: are covered B: is covered C: have been covered D: was covered