To a worker, ________ from the point of view of society is necessary labor is from his own point of view voluntary play.
A、whatA
本題要求填入一個關系代詞引導主語從句，并在主語從句中作主語，所以選what。
名詞解釋：preferredstock
The challenge is not one of expansion. _______, the rapid growth in enrollment over the last 40 years has come to an end.
I would love ________ to the party last night but I had to work extra hours to finish a report.
Peopleappreciate_______withhimbecauseheisknowledgeableandhumorous.
Imports will be allowed in proportion _______ exports.
