I ______ writing the paper as scheduled, but my mother's 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
【正确答案】
B
【答案解析】
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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