【单选题】A、newtechnique______,theyieldsasawholeincreasedby20percent.A、workingoutB、havingworkedoutC、havingbeenworkedoutD、tohavebeenworkedout
【单选题】A、newtechnique______,theyieldsasawholeincreasedby20percent.A、workingoutB、havingworkedoutC、havingbeenworkedoutD、tohavebeenworkedout



