He is tearing up what he has written and beginning over again.
A. constantly
B. simply
C. gradually
D. generally
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(答案→)A. constantly
B. simply
C. gradually
D. generally
解析：考查词义辨析。Constantly 不断地，simply 仅仅，gradually 逐渐地，generally一般地，句意：他不断撕毁他已经写得东西并且反复开始。所以选A。