trees are planted in our city every year.

问题描述:

trees are planted in our city every year.
A.The millions of B.Million of C.Millions of D.Million
为什么要加the

每一年都有millions of trees,每一年都要植那么多树,所以加the
如果说只是有那么多树被种植在这个城市就不用加the了