13. The shopper was angry when he realized he.................it cheaper at the other store.

Answer: C

Explanation:

The shopper was angry when he realized he could have gotten it cheaper at the other store.

The phrase "could have gotten" indicates a past opportunity that was not taken, which aligns with the shopper's realization and subsequent anger about missing a better deal.

A) got

This option is incorrect because "got" indicates a completed action in the past and does not convey the potentiality or missed opportunity that the shopper is reflecting on. The context requires a phrase that illustrates regret over a possibility that was not acted upon.

B) could have got

While this option is grammatically acceptable in some dialects, it lacks the standard form used in American English, which favors "could have gotten." Therefore, it does not fit the context as precisely as the correct answer does.

C) could have gotten

This option is correct as it accurately expresses that the shopper had the potential to obtain the item at a lower price but did not do so. It captures the sense of regret and reflects the emotional context of the shopper's anger.

D) might have gotten

This option suggests a possibility rather than an opportunity that was missed. While it conveys uncertainty, it does not express the same level of regret or realization about a specific missed chance as "could have gotten" does.

Conclusion

The correct answer, "could have gotten," effectively conveys the shopper's realization of a missed opportunity, resulting in his anger. Other options either misrepresent the nature of the past action or fail to adequately express the emotional nuance of regret associated with the situation. Thus, "could have gotten" is the most fitting choice.