（ ）that they had made an important discovery in science Little they realized
题目
（ ）that they had made an important discovery in science Little they realized
They had realized little Little did they realize Little had they realized
能详细解答吗？
答案
Little did they realize
副词在句首要倒装（little)
had made an important discovery 是过去完成时,前面要用一般过去时(did)
所以就是第二个啦~
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