LAST YEAR, THEY...22 MILLION TV SETS.A. WERE SELLINGB. HAD SOLDC....

71. - TONG HOP BAI TAP TRAC NGHIEM VE CAC THI TRONG TIENG ANH
TONG HOP BAI TAP TRAC NGHIEM VE CAC THI TRONG TIENG ANH

71.

Last year, they...22 million TV sets.

A.

were selling

B.

had sold

C.

has sold

D.

sold