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He ______busy yesterday,or he______you with your experiment.
A.was;had helped
B.was;would have helped
C.had been;would have helped
D.were;would have helped
B
该题根据交际情景考查时态的用法。第一句有明确的时间状语yesterday,故用过去时。后一句表示过去的动作并没有发生,故用“would have done”。
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