playing basketball and volleyball----what he likes most

问题描述:

playing basketball and volleyball----what he likes most
a.are b.to be c.was d.is
请告诉为什么选择的理由,拜托了

选D意思是:篮球、排球是他最喜欢的.前面playing basketball and volleyball 作为一个整体,后面谓语用单数形式.