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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:本题实际上考察的是or(否则,要不然)引导的含蓄的虚拟条件句。前面句中含有yesterday这个过去时的时间状语,故使用过去时即可。Or后面的句中要使用与过去事实相反的虚拟语气would have done的形式。句义:昨天他很忙,要不然他就会帮助你做实验了。故B正确。
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