The professor was to give us a lecture this afternoon but it has been cancelled because

问题补充：

The professor was to give us a lecture this afternoon, but it has been cancelled because of the delayed flight.

A. demanded

B. hoped

C. scheduled

D. arranged

答案：

A. demanded

B. hoped

(答案→)C. scheduled

D. arranged

解析：考查动词搭配：A. demanded要求，B. hoped希望，C. scheduled计划，D. arranged安排，AB两个动词都不能接sb to do，arrange 后面接for sb to do sth。词组 be scheduled to do计划做某事，句意：教授准备今天下午给我们做一场讲座，但因为航班延误被推迟了。选C。