500 Câu trắc nghiệm tổng hợp ngữ pháp Tiếng Anh thi THPT Quốc gia (Phần 6)
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Mike came across his old friend - Maria while he _______ along the street

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Mike came across his old friend - Maria while he _______ along the street.

had walked

would walk

was walking

walked

Giải thích

Chọn C