问个英语问题 because fuel supplies are finite and many p

题目

问个英语问题 because fuel supplies are finite and many p
问个英语问题
because fuel supplies are finite and many people are wasteful,we will have to install_solar heating device in our home.
a.some type of b.some types of a
c.some type of a d.some types of

答案

我选B 选D的要看清device哦