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 句意:鲍勃昨天打算帮助我们,但是他太忙了。前句表示对过去的虚拟,而but之后表示过去的客观事实,故用一般过去时态。因此答案为A。
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