I could see a cat ___ from the fence it was trying to climb.a) to fallb) fallc) fallingd) fell

To fill in the blank in the sentence, we need to analyze the context and grammatical structure of the sentence provided.

Sentence Analysis

The sentence is: "I could see a cat ___ from the fence it was trying to climb." Here, the verb following "see" should describe the action of the cat in a manner that fits grammatically and semantically.

Option Evaluation

1. a) to fall - This option suggests the cat is about to fall, which could work but feels a bit awkward in this context.
2. b) fall - This infinitive form also does not quite fit the immediate past action structure of the sentence.
3. c) falling - This gerund form indicates that the cat is in the process of falling, aligning well with the ongoing nature of the action.
4. d) fell - This past tense form suggests that the cat has already fallen, which changes the timing of the action.

Conclusion

Given the need for a word that indicates an ongoing action as the cat is attempting to climb the fence, option c) falling is the most appropriate choice.

Final Answer

I could see a cat falling from the fence it was trying to climb.