. _______ it or not, his discovery has created a stir in scientific circles.
A、Believe
B、To believe
C、Believing
D、Believed
【正确答案】：A
【题目解析】：A【句意】信不信由你，他的发现在科技界引起了震动。【解析】believe it or not是习惯用语，常用于口语中，意为“信不信由你，我说的是真的”。如：Believe it or not，he was granted a full scholarship by Harvard University.信不信由你，哈佛大学给他提供了全额奖学金。Believe it or not，I'm feeling quite homesick．我很想家，我说的是真话。