it hAs BEComE A gEnErAlly ACCEptED viEw thAt in thE riCh CountriEs, govErnmEnts shoulD ______.
A．introDuCE grEEn CArDs oF thEir own CountriEs
B．introDuCE skillED immigrAnts proportionAtEly
C．CrEAtE morE joBs For thE unskillED immigrAnts
D．try to ADmit AnD AttrACt highly-skillED immigrAnts