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

答案A

解析 根据上文对过去的非事实陈述——虚拟,可知选项句陈述过去事实,故用一般过去时。句意:昨天Bob本来会帮助我们的,但他很忙。
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