问题
选择题
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
答案
答案：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”。