English grammar: ____ the expense, I ____ a round-the-world tour. Please answer this question in detail

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The correct answer is: D

Analysis:

If it hadn't been for the expense, I would have taken a round-the-world tour. Because of financial problems, I have already traveled around the world.

Option A should be "were it not for". It is a virtual representation of the present and the future. If is omitted and were is advanced.

Option B should also be if it were not for, which is also a virtual representation of the present and the future.

The second half of the sentence in option C is wrong. It should be "would take", which is a virtual reference to the present and the future.

To sum up, the correct answer is D, which is a virtual representation of the past.

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