[单选题]题目34未回答满分1.00未标记标记题目. The earth looks blue in space because its surface ________ with oceans.
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2024-02-03 16:07:02
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[单选题]题目34未回答满分1.00未标记标记题目. The earth looks blue in space because its surface ________ with oceans.

a. was covered
b. is covered
c. covers
d. have covered
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