Bộ 20 đề ôn thi vào Chuyên Anh năm 2023 có đáp án (Đề 18)

travel insurance is a way of earning money making false claims against insurance companies.

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But for (3)_____, travel insurance is a way of earning money (4) ______ making false claims against insurance companies.

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Giải thích

(4) by