By thE EnD oF this CEntury intElligEnt roBot ______ to Do most oF thE housEwork For mAn.
A．is ExpECtED to BE invEntED
B．will hAvE BEEn ExpECtED to BE invEntED
C．hAs BEEn ExpECtED to BE invEntED
D．is ExpECtED to hAvE BEEn invEntED