The workers were told that they mus

The workers were told that they must keep up with the changes or they would find themselves without jobs.

結果 (繁體中文) 1:

工人們被告知他們必須跟上變化，或他們會發現自己沒有工作。

結果 (繁體中文) 2:

工人們被告知，他們必須跟上變化或者他們會發現自己沒有工作。

結果 (繁體中文) 3:

工人們被告知，他們必須跟上變化，否則他們會發現自己沒有工作。