Which verb form correctly completes the sentence: 'If he ____ late, the meeting will be postponed.'
答案解析
**Core Concept**: Subjunctive mood (Grammar).
**Analysis**: The sentence describes a hypothetical condition. The subjunctive 'were' (C) is required for formal hypotheticals, even with singular subjects.
- **A. is** and **D. will be** use indicative mood for real conditions.
- **B. was** is informal subjunctive.
**Key Point**: Subjunctive 'were' applies to all subjects.
**Common Mistake**: Misusing 'was' in hypothetical clauses.
正确答案：C