There was a time when the owners of shops and businesses in Chicago had to pay large sums of money to gangsters in return for protection.
请问此处的when可以用that替代吗?
in return for protection 在这里理解为原因还是目的?
1 可以。关系副词that可以在定语从句作方式、原因、地点和时间状语。但用关系副词that属于非正式语体,所以that通常省略。
2 in return for为目的状语。
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