【单选题】

______, he always tries his best to solve it.
A．Though difficult the problem is

B．However difficult the problem is
C．Though difficult is the problem
D．However the problem is difficult

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根据网考网移动考试中心的统计，该试题：

39%的考友选择了A选项

51%的考友选择了B选项

1%的考友选择了C选项

9%的考友选择了D选项

______, he always tries his best to solve it.A．Though difficult the problem is