题目内容
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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Bob would have helped us yesterday, but he-_______
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Bob would have helped us yesterday ,but he_______________.
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