I _______ writing the paper as scheduled, but my mother’s illness interfered. I

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问题 I _______ writing the paper as scheduled, but my mother’s illness interfered. I hope you will excuse me.

选项 A、am to have finished
B、was to have finished
C、was to finish
D、ought to finish

答案 B

解析 be to do表示已经计划好，马上要做的事情，be to have done本应该做某事(而没有做)。根据but分句所使用的一般过去时可知，本句的动作发生在过去，故用B项was to have finished。

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