100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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 Phuong caught the flu because he ________ (walk) in the rain too long.

31/100

 Phuong caught the flu because he ________ (walk) in the rain too long.

had been walking

had walked

had walk

had walking

Giải thích

Chọn đáp án: A