Choose the correct grammatical structure: 'If he ______ more careful, the mistake ______ avoided.'

Choose the correct grammatical structure: 'If he more careful, the mistake avoided.'

A. was; could be

B. were; could have been

C. had been; can be

D. has been; would have been

答案解析

核心考点：虚拟语气时态搭配。正确答案为B. were; could have been。此为与过去事实相反的虚拟语气标准结构：条件从句用were（所有人称通用），主句用could have done。错误选项分析： A. was不符合虚拟语气be动词统一用were的规则； C. 主句时态can be与虚拟条件矛盾； D. has been为现在完成时，与虚拟结构时序不符。易错点提醒：需牢记虚拟语气中be动词在条件从句中必须用were，无论主语人称。

正确答案：B

Choose the correct grammatical structure: 'If he ______ more careful, the mistake ______ avoided.'

答案解析

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Choose the correct grammatical structure: 'If he more careful, the mistake avoided.'