The( )production of engines in our factory has doubled this
The production in this factory had increased faster than ___
The population of many Alaskan cities has ______ doubled in
In the second quarter of this year,our production was only o
The population of the world has more than doubled in the pas
the number of girls receiving college education has doubled
Since they _the new method,their production has doubled
Is_in this factory,_is in the possession of Mr.Smith_several
Is_in this factory,_is in the possesion of Mr.Smith_several
The number of workers in this factory _____ 1,500.
the manager and secretary is in charge of this factory
(whether)this material can be used in our factory has not be
The Blacks ___ in this factory since 1998 A has worked B has