Which sentence correctly uses the subjunctive mood for a hypothetical situation?
答案解析
**Core Concept**: Grammar (subjunctive mood).
**Analysis**: The subjunctive mood uses 'were' (not 'was') for hypotheticals, regardless of subject (e.g., 'If I were...').
**Error Check**: A uses 'was' incorrectly; C/D mix tenses illogically (present/future in C; past perfect + simple past in D).
正确答案:B