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【单选题】

He promised me a letter; he ought to ______ it days ago.
A．have written

B．write
C．had written
D．be writing
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根据网考网移动考试中心的统计，该试题：

79%的考友选择了A选项

8%的考友选择了B选项

4%的考友选择了C选项

9%的考友选择了D选项

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