单项选择题

The lecture was supposed to start at three, but it was delayed half an hour.

A.讲座以为在三点钟开始,但半个小时以后就开场了。
B.讲话被以为在三点钟开始,但被延误了近半个小时。
C.讲演本该在三点钟开始,但迟了半个多小时。
D.讲座应该在三点钟开始,但被耽搁了半个小时。