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
网友回答
A. was;had helped
(答案→)B. was;would have helped
C. had been;would have helped
D. were;would have helped
解析：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”。