______a serious crime, what exactly should you do?

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问题 ______a serious crime, what exactly should you do?

选项 A、Unless you witness
B、If you were to witness
C、If only you witness
D、Since you witness

答案B

解析句意：假如你目睹了一场严重的犯罪，你会怎么做?此句为虚拟语气，if从句中用过去式，表示不可能实现，大概不会实现或提出作为考虑的假定条件。

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C类竞赛（非英语专业本科）

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