Bob would have helped us yesterday, but he______.

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问题 Bob would have helped us yesterday, but he______.

选项 A、is busy
B、was busy
C、had been busy
D、will be busy

答案B

解析根据would have helped us(虚拟语气)可知这一动作没有发生，因为“他很忙(真实情况)，因此空白处用陈述语气。根据yesterday可知应该用一般过去时。”

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