Yet buying and selling – the lifeblood of business – was still being done by instinct.

Yet buying and selling – the lifeblood of business – was still being done by instinct.
请问为什么主语是buying and selling，有and，而动词用was ,不用were

selling leads and buying leads的最佳翻译 And if scientist have yet to Ten years passed,and yet she______the same as before 急啊！！！英语高手来啊！！求My view on college students trading and buying stocks范文！ When and where to go for the on-salary holiday ______ yet artists' only job is to explore emotions ,and yet .......翻译 there is yet anther major factor in this bond between asian parents and their children. I am very sorry about sonmthing happened this afternoon, and it have been solved yet . Mike and Jack have arrived, but _______ students of their class aren’t here yet. I ordered my food half an hour ago and it hasn't _______ yet.