D. The green chlorophyll normally masks the fall-colored pigments during the warmer months, but as sunlight becomes less abundant and trees become frozen, the fall.......
If the options provided are <em>does, ran, goes, done, </em>then we have to take into consideration the first pair of the words. They are both used in the same form, past participle. That means that our answer has to have the same form as the word <em>did. </em>The only such word is ran. They are both past tenses, whereas <em>does </em>and <em>goes </em>are present, and <em>done </em>is past participle.
