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【单选题】

(Due to) persistent inbreeding, self-pollinating plants (have) genetically more uniform than cross-pollinated plants,(which) harbor more genetic (variability).
A．Due to

B．have
C．which
D．variability
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根据网考网移动考试中心的统计，该试题：

9%的考友选择了A选项

80%的考友选择了B选项

4%的考友选择了C选项

7%的考友选择了D选项

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