3道英语单选再请教!
3.As is put in the report,the new machine will work twice as fast,thus ____ the costs of our products.
A.being reduced B.to reduce C.to be reduced D.deducing
4.The public were surprised at the news that the U.S.President Obama was reported _____the 2009 Noble peace prize.
A.winning B.having won C.to have won D.to win
5.This book has been considered as _____ must-read book for a beginner who wants to have _____ good knowledge of art.
A.a;a B.the;a C.a;the D.the;/