I ______ writing the paper as scheduled but my mothers illness interfered. I hope you wil

外语类 2017-08-17 00:05:21 已帮助人

I ______ writing the paper as scheduled, but my mothers illness interfered. I hope you will excuse me.

A．am to have finished

B．was to have finished

C．was to finish

D．ought to finish

请帮忙给出正确答案和分析，谢谢！

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正确答案：B
betodo表示已经计划好，马上要做的事情，betohavedone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wastohavefinished。