Children,inmyopinion,____creativeabilityisunthinkablyrich,____isseld
Children,inmyopinion,___creativeabilityisunthinkablyrich,___isseldomtakennoticeofbyus,shouldtrainedinthatarea.
Awhich;thatBwhose'whichCwhich;whichDwhose;that
为什么第二个空用which,而不用who