Since the movie was released seventeen UFOs have been sighted in the state, which is more than had been sighted in the past ten years together.
A which is more than had been sighted
B more than had been sighted
C more than they had sighted
D more than had reported sightings
E which is more than had reported sightings
答案是B,但我不理解Since the movie was released seventeen UFOs have been sighted in the state这句话中,was released和have been sighted到底谁是真正的谓语,如果是,那另一个作什么成分呢?
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