环球旅游英语

你好，很高兴为你解答。

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正确答案是：D

解析：

If it hadn't been forthe expense, I would have takena round-the-world tour.

A选项应该是 were it not for 才对，是对现在和将来的虚拟，省略了 if ，将 were 提前了。

B 选项也应该是 if it were not for 才对，也是对现在和将来的虚拟。

C选项的后半句不对，应该是 would take 才对，是对现在和将来的虚拟。

综上所述，正确答案是D，这里是对过去的虚拟。

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