题目内容：

It___until dust that he realized that it was too late to reture home.A:was B:wasn't 请问：...
It___until dust that he realized that it was too late to reture home.
A:was B:wasn't
请问：选哪个,为什么,
如果选择wasn't 是正确的话，请问为什么？

优质解答

B.Wasn't
这句话的意思是已经到傍晚他才发现“it was too late to return home” 所以应该用 wasn't