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
题目分析：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。