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。
There are many sales this season, during which stores will lower their _______ prices.
I would love ________ to the party last night but I had to work extra hours to finish a report.