If their forces were not involved, then who is to blame?

如果他们的军队没有参与，那么谁应该受到指责呢？

《柯林斯英汉双解大词典》

If they decide to invest in color-changing tile that looks like slate at first glance, because it makes them happy, then who are we to deny their choices?

如果他们决定投资第一眼看上去像是石板砖的变色瓷砖，因为这让他们高兴，那么我们凭什么去否定他们的选择呢？

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Then who does tell you?

那么，谁来告诉你？

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American workers then began to protest,as their jobs were filled by immigrants who were happy to work for less money.

VOA: special.2010.05.20

But then who would understand better than John Milton, Sr. the importance or the value of a long-term investment strategy?

但在那时谁又比弥尔顿先生更懂得,长远投资的重要性呢？

耶鲁公开课 - 弥尔顿课程节选

And then we sort of make a list of who we think would be a good fit for our sorority,

然后我们就形成一个我们觉得适合加入我们联谊会的名单，

加入女生社团 - SpeakingMax英语口语达人

And if you want to replace it with something, then who's going to replace it?

NPR: U.S. Non-Intervention In Syria Could Mirror Outcome In Congo

If the big firms like Merrill and Morgan are losing assets then who is winning them?

FORBES: Merrill Lynch, Morgan Stanley, Wells Fargo Keep Losing Market Share, And They May Be OK With It

We can provide some hidden gems (for consumers) then who knows what will happen.

FORBES: Former Groupon Exec's Prescreen Provides Outlet For Indie Movies