It is important that we ( )the news secret.

C.
虚拟语气类型之一：
如果有表示必要性、重要性等含义的形容词,that 引导的主语从句中,谓语动词要用虚拟语气,其形式与有表示建议、命令、要求等含义的过去分词结构中的主语从句谓语动词相同
It is＋important(重要的)＋that＋主语＋should＋原形动词,should可以省略.
这类形容词还有：advisable,essential,important,urgent,imperative等.例如：
It is important that we (should ) speak politely.
我们说话要有礼貌,这是很重要的.
It is imperative that we (should ) practise criticism and self-criticism.
应当进行批评和自我批评.

C，固定的
it is +形容词（像 important ）that +sb should do