From the space, the astronaut can see more than 70 percent of the earth _____ by water.

A. are covered
B. is covered
C. covering
D. cover
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科目：初中英語 來源：河北省模擬題 題型：單選題

From the space, the astronaut can see more than 70 percent of the earth _____ by water.
[     ]
A. are covered
B. is covered
C. covering
D. cover

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