All of the tourists would have enjoyed themselves more if there ______ offers for free insurance policies.

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问题 All of the tourists would have enjoyed themselves more if there ______ offers for free insurance policies.

选项 A、were
B、have been
C、had been
D、should be

答案C

解析 本句是虚拟语气的句式。主句里用的是和过去相反的时态:过去将来完成时。那么非真实条件句里的谓语动词就要用过去完成时。
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