Alan was not a confident person, and that was why he was so shy. due to
Alan was not a confident person, and that was why he was so shy. (due to)
Đáp án: Alan's shyness was due to his lack of confidence.
Giải thích: due to N/Ving: bởi vì
Dịch: Sự nhút nhát của Alan là do anh thiếu tự tin.