33．We ____ hard together to achieve our common goal these years —to build a cleaner,safer and healthier world．\x05A．have been working \x05\x05\x05B．are working \x05\x05C．work \x05\x05\x05D．have worked

33．We ____ hard together to achieve our common goal these years —to build a cleaner,safer and healthier world．\x05A．have been working \x05\x05\x05B．are working \x05\x05C．work \x05\x05\x05D．have worked
33．We ____ hard together to achieve our common goal these years —to build a cleaner,safer and healthier world．
\x05A．have been working \x05\x05\x05B．are working \x05
\x05C．work \x05\x05\x05D．have worked

33．We ____ hard together to achieve our common goal these years —to build a cleaner,safer and healthier world．\x05A．have been working \x05\x05\x05B．are working \x05\x05C．work \x05\x05\x05D．have worked
A
现在完成进行时have been doing.
these years 这样的时间词一般用现在完成进行时,表示最近这些年都在干某事.
have been doing 表示（最近几年）一直都在干某事,可能现在还在干.

B