WHILE HE ……….IN THE PARK, HE FOUND A WATCH.A. WAKING B. WALKED C. I...

3. - THI HKII 8 MA TRAN DAP AN
THI HKII 8 MA TRAN DAP AN
3. While he ……….in the park, he found a watch.A. waking B. walked C. is walking D. was walking