What he had done is _______
C
of+n=adj，可以作表语。ofnovalue：没有一点价值。value是名词，不能作表语，也不能形容主语的性质。B和D都是of+adj的结构，是错误的。
MarkTwainemployedanunpretentiousstyleof()inhisnovelswhichisbestdescribedas“vernacular”.
MarkTwain’sparticularconcernaboutthelocalcharacterofaregioncameaboutas“localcolorism,”auniquevariationofAmericanliterary().
OppositionleaderswillbewatchingcarefullytoseehowthePrimeMinister________thecrisis.
RobertFrostisgenerallyconsideredaregionalpoetwhosesubjectmattersmainlyfocusonthelandscapeandpeoplein().
HenryJames’famegenerallyrestsuponhisnovelsandstorieswiththe()theme.