had never occurred to him that he might be falling in love with the new school.
A. He
B. That
C. It
D. This
网友回答
A. He
B. That
(答案→)C. It
D. This
解析：考查形式主语和固定句型。Sth occur to sb某人突然想起某事；it是形式主语，that he might be falling in love with the new school.是真正的主语。