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  3. ______more careful, such spelling mistakes might have been avoided.

______more careful, such spelling mistakes might have been avoided.

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问题 ______more careful, such spelling mistakes might have been avoided.
选项 A、You had been
B、You have been
C、Had you been
D、Have you been
答案C
解析 考查虚拟语气。If条件句省略if后主谓倒装。排除选项A和B。主句用了现在完成时，从句应用过去完成时表示与事实相反。选项C是正确的。
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