The student went through the paper, finding some mistakes that might have been ignored.
A. otherwise
B. therefore
C. nevertheless
D. besides
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(答案→)A. otherwise
B. therefore
C. nevertheless
D. besides
解析:otherwise否则; therefore 因此; nevertheless然而,不过; besides而且。
句意:学生浏览了报纸,发现一些错误,要不然的话,这些错误就被忽视了。根据句意应选A。