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同学你好~
当虚拟条件句的谓语部分含有were, should, had时，我们可以将连词if省略掉，而将were, should, had置于句首。如：

If she were in charge, she would do things differently.=Were she in charge, she would do things differently. 如果是她负责，她会是另一种做法。

If you should change your mind, no one would blame you.=Should you change your mind, no one would blame you. 万一你改变主意，谁也不会怨你。

If the management had acted sooner, the strike wouldn’t have happened.= Had the management acted sooner, the strike wouldn’t have happened. 如果资方早些采取行动，就不会发生罢工了。

这里had one not asked for it 是 if one had not asked for it的省略和倒装形式。
这是虚拟条件句，had asked表示的是和过去相反的情况



祝同学学习进步~