Toaworker,________fromthepointofviewofsocietyisnecessarylaborisfromhisownpointofviewvoluntaryplay.
A、whatA
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。
—Youwerebraveenoughtoraiseobjectionsatthemeeting.
—Well,nowIregret________that.
The traffic was held up for more than thirty minutes, ________ caused me to arrive late.
Theybuiltahighway_______themountains.
Thechallengeisnotoneofexpansion._______,therapidgrowthinenrollmentoverthelast40yearshascometoanend.
The challenge is not one of expansion. _______, the rapid growth in enrollment over the last 40 years has come to an end.
