If the captain ____more careful, his ship would not have been sunk.

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问题 If the captain ____more careful, his ship would not have been sunk.

选项 A、should be
B、were to be
C、Were
D、had been

答案D

解析虚拟语气。if引导的非真实性条件句，表示与过去事实相反的情况，从句用“if+主语+had+-ed分词”结构，主句使用“主语+would have+-ed分词”结构。

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