Since time began, it seems, people have been putting off______they______have done today, scolding themselves in the meantime．
A．that, mustB．that, shouldC．what, couldD．what, would
C

句意是：自從時間開始，人們一直推遲他們本可以今天做的事，同時又會責備自己。第一空用what引導賓語從句，做do的賓語，第二空填could，表示虛擬語氣，could have done是本可以做卻沒有做。選C。
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