单选题：Iamawfullysorry,butIhadnoalternative.Isimply__________whatId

题目内容：

Iamawfullysorry,butIhadnoalternative.Isimply__________whatIdid. A．oughttohavedone
B．coulddo
C．hadtodo
D．mustdo

参考答案：

答案解析：

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