To a worker, ________ from the point of view of society is necessary labor is from his own point of view voluntary play.
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。
Theybuiltahighway_______themountains.
Importswillbeallowedinproportion_______exports.
名词解释：silentpartnership
TheFrenchmaintaina________separationofpersonalandprofessionallife.
TheRomangoddessVenusisidentified_______theGreekgoddessAphrodite.
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