The factory has been ______ black smoke from its chimneys.

A.wllble

B.has been

C.was

D.be

A. has been built

B.had built

C.was built

D.has built

output of cement in the factory ________ by about 10%.

A) will have risen B) has risen

C) will be rising D) has been rising

A.be

B.will be

C.was

D.has been

A.wasbuit

B.has built

C.had built

D.has been built

has been a center for hat manufacturing in the United States.

A、were established

B、was establishing

C、had been established

D、was established

___________________（这家工厂就在这里了)since the 1970s.（factory, been, has, The, here)

A.The factory was registered to ISO 9002 and sQ 9000 International Quality System Standard.

B.The factory has registered to ISO 9002 and sQ 9000Internatinal Quality System Standard.

C.The factory is registered to ISO 9002 and SQ 9000Intemational Quality System Standard.

D.The factory has been registered to ISO 9002andSQ 9000InternationalQualitySystem Standard.

A、has not been decided

B、are not decided

C、has not decided

D、have not decided

A.They have greatly improved the quality of production in this factory.

B.The quality of production of this factory has been greatly improved.

C.Great improvement has been made in the production quality of the factory.

D.Great improvement has made in the production quality of the factory.