It was when we were returning home ________ I realized what a good feeling it was to have helped someone in trouble. ( 章节：1 难度：2)_做题室

单项选择题It was when we were returning home ________ I realized what a good feeling it was to have helped someone in trouble. ( 章节：1 难度：2): A、which; B、that; C、where; D、how

正确答案：B
答案解析：
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