The correct answer is D. No improvement.
The sentence “When we saw him last, he ran to catch a bus” is in the past tense. The verb “ran” is the simple past tense of the verb “run.” The simple past tense is used to talk about events that happened in the past. In this case, the event is that the person ran to catch a bus.
The other options are not correct because they are not in the past tense. Option A, “was running,” is in the past progressive tense. The past progressive tense is used to talk about events that were happening in the past at a specific time. In this case, the sentence does not say that the person was running at a specific time. Option B, “has run,” is in
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