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[单选题]
Seventy-five percent of the earth’s surface ______ with water.
A
is covered
B
is covering
C
were covered
D
are covered
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参考答案
试题答案：
A
答案解释：
解析：选A. 本句缺谓语，主语percent后面是不可数名词，所以要用第三人称单数形式。
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