【单选题】

They failed to pass the exam last time, I regretted ______.
A．to be not able to help

B．being unable to help
C．being not able to helping
D．not be able to help

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根据网考网移动考试中心的统计，该试题：

7%的考友选择了A选项

85%的考友选择了B选项

2%的考友选择了C选项

6%的考友选择了D选项

They failed to pass the exam last time, I regretted ______.A．to be not able to help