根据网考网考试中心的统计分析，以下试题在2018/1/9日成人英语三级考试习题练习中，答错率较高，为：83%
【单选题】I ______ to him because he phoned me shortly afterwards.
A. ought to not have written
B. shouldn't have written
C. couldn't have written
D. needn't have written
网考网参考答案：D，答错率：83%
网考网试题解析：
根据题意，表示“不必”，应用情态动词needn't。
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