There has been a nation-wide shortage of building materials ( )which the trade is onl

There has been a collision ___ a number ？

There has been a collision ___ a number of ？

There has been a collision a number of ？

Why there are fewer plants, trees and flowers in Holland now？A．Because there has been a lo

Why have there been difficulties with the machinery for the new product？A．It has been nece

There has been a change in doctors’ understanding