问题
单项选择题
I guess the whole paper has to be rewritten; only the first few paragraphs may be（）
A.sustained
B.contained
C.maintained
D.retained
答案
参考答案：B
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I guess the whole paper has to be rewritten; only the first few paragraphs may be（）
A.sustained
B.contained
C.maintained
D.retained
参考答案：B