题目内容
Bob would have helped us yesterday，but he ．
A. was busy B．is busy C had been busy D．will be busy
A
考查句子的时态。 题意：昨天Bob本来会帮助我们的，可是（当时）他很忙。根据前半句中的时间副词yesterday和句意可知，本句应该使用一般过去时。
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Bob would have helped us yesterday, but he-_______
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