【单选题】
Geothermal energy is a potentially inexhaustible energy source ______been tapped by humans for centuries but,until recent years,only on a small scale.
A、
A、has it
B.has
C.that has
D.that it has
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根据网考网移动考试中心的统计,该试题:
2%的考友选择了A选项
0%的考友选择了B选项
70%的考友选择了C选项
28%的考友选择了D选项