I______doing my homework as scheduled, but my father’s illness interfered.Could

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问题 I______doing my homework as scheduled, but my father’s illness interfered.
Could you excuse me?

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

答案 B

解析此题测试的是be to+have done表示要实现而没有实现的动作。句中转折连词but已暗含finish my homework as scheduled没有实现。关键是考生要掌握be to have done的虚拟用法。

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