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He ___________busy yesterday, or he __________you with your experiment.
A.was; had helpedB.was; would have helped
C.had been; would have helpedD.were; would have helped
B

试题分析:考查时态和虚拟语气:句意:昨天他很忙,否则,他就可以帮助你做实验了。第一空是过去的事实,用一般过去式,这里or相当于if he hadn’t been busy这样的虚拟语气条件句,所以后面的主句用would have helped。选B。
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