Question

【题目】There was never a time when I had not called him and he did not call me right back within a couple of ________(hour)．

Answer 1

【答案】hours

【解析】句意：当我给他打电话，如果他没接的话，他都会在几小时内回电话。可数名词hour前有a couple of修饰，故用复数形式。