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。
“Thedignityofmovementofanicebergisduetoonlyone-eighthofitbeingabovewater.”This“iceberg”analogyaboutprosestylewasputforwardby().
The()Ageofthe1920scharacterizedbyfrivolityandcarelessnessisbroughtvividlytolifeinTheGreatGatsby.
ThePortraitofALadyisgenerallyconsideredtobe()masterpiece,whichdescribesthelifejourneyofanAmerican()inaEuropeanculturalenvironment.
Attheageofeighty-seven,()readhispoetryattheinaugurationofPresidentJohnin1961.
Likeallnaturalists,()wasrestrainedfromfindingasolutiontothesocialproblemsthatappearedinhisnovelsandaccordinglyalmostallhisworkshavetragicendings.