来自马文光的问题
TheTVmanufacturerismuchmoreproductive．Thisyears'productionisthreetimes_____itwasfiveyearsago．（）A.whatB.thatC.thanD.as
The TV manufacturer is much more productive．This years'production is three times _____ it was five years ago．（）
A.what
B.that
C.than
D.as
