单选题:I am sorry!I took your book ______.A.by mistake B.by mistakes

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单选题:I am sorry!I took your book ______.A.by mistake B.by mistakes
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单选题:I am sorry!I took your book ______.A.by mistake B.by mistakes
单选题:I am sorry!I took your book ______.
A.by mistake B.by mistakes

单选题:I am sorry!I took your book ______.A.by mistake B.by mistakes
单选题:I am sorry!I took your book ______.
A.by mistake
B.by mistakes
应选:A
解析:固定短语 by mistake 错误地,by + 名词单数

A,因为没表明是复数啊