He busy yesterday or he you with your experiment.A. was; had helpedB. was; would have h

问题补充：

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：

A. was; had helped

(答案→)B. was; would have helped

C. had been; would have helped

D. were; would have helped

解析：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。