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

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：考查时态和虚拟语气：句意：昨天他很忙，否则，他就可以帮助你做实验了。第一空是过去的事实，用一般过去式，这里or相当于if he hadn’t been busy这样的虚拟语气条件句，所以后面的主句用would have helped。选B。