单选题
The speaker was ______ delivered her presentation this morning, but she could not make it to the venue on time.
A、
had
B、
having
C、
to have
D、
having been
【正确答案】
C
【答案解析】
动词不定式出现在be动词的后面，表示预定或者有义务做某事。另外为了描述在过去某个时间之前发生的未知事件，需要使用完成时态的不定式。正确答案是(C)选项to have。
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