Bob would have helped us yesterday, but

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问题 Bob would have helped us yesterday, but he_______．A.was busyB.is busyC.had been busyD.will be busy

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

答案 A

解析本题考查时态。句意：Bob昨天本要帮助我们的，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。

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