题干
It is believed that if an event is ______, it will surely ______ the readers of the paper.
A：astonished; astonish
B：astonishing; be astonished
C：astonishing; astonish
D：astonished; be astonished
答案(点此获取答案解析）
C
,则使
成立的一个充分不必要条件是（ ）