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Bob would have helped us  yesterday ,but he_______________.

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

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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