Correct option is C
Option (c) contains the error.
Explanation: “have walked” is present perfect tense, but the rest of the sentence is in past tense. It should be:
“when I walked”.
Correct sentence: He was playing cricket when I walked past the stadium early in the morning.
Grammatical Rule Used:
✔ Use
simple past to describe a completed action in the past when it occurs alongside another past continuous action.
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Information Booster:
Past continuous + when + simple past = correct sequence