Toaworker,________fromthepointofviewofsocietyisnecessarylaborisfromhisownpointofviewvoluntaryplay.
A
本题要求填入一个关系代词引导主语从句，并在主语从句中作主语，所以选 what。
The wounded soldiers would recover quickly if they were well ________.
Therearemanysalesthisseason,duringwhichstoreswilllowertheir_______prices.