摘要：Bob would have helped us yesterday.but he . 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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