What am I missing? The lesson says that all three options are interchangeable, but the test result says that I got it almost correct when I chose "podía haber reducido" instead of "podría haber reducido."
The system is telling you it is "nearly" correct instead of "100% correct" because in multiple answer questions, the student needs to identify all the possible correct answers, not only some of them, to get it all correct.
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Test your Spanish to the CEFR standard