Bộ 10 đề ôn thi học sinh giỏi Tiếng anh 9 năm 2023 có đáp án (Đề 3)

This causes many problems, including serious air pollution, lengthy delays, and the greater risk (56) _________ accidents.

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This causes many problems, including serious air pollution, lengthy delays, and the greater risk (56) _________ accidents.

of

for

about

by

Giải thích

Chọn A