试题题干
It（）that the UFO had appeared in the small town and hovered over the square in it for quite a long time.
参考答案
正确答案：
试题解析
句意：据说UFO已经出现在小镇上，在广场上徘徊了很长一段时间。根据后文had appeared过去完成时，可知空格处应用一般过去时，故选C
It（）that the UFO had appeared in the small town and hovered over the square in it for quite a long time.
句意：据说UFO已经出现在小镇上，在广场上徘徊了很长一段时间。根据后文had appeared过去完成时，可知空格处应用一般过去时，故选C