Nearly (three quarters) of the surface of the earth (are) covered with water, and there (would be) even less land (if) the polar

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问题 Nearly (three quarters) of the surface of the earth (are) covered with water, and there (would be) even less land (if) the polar icecaps were melted.

选项 A、three quarters
B、are
C、would be
D、if

答案B

解析
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