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 考查时态。根据前半句的虚拟结构可知该句描述过去的事实,所以用一般过去时。句意为:Bob昨天本可以帮助我们的,但他很忙。
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