Bộ 20 đề ôn thi Chuyên Anh năm 2023 (Đề 67)

The traffic problem has improved _____, out of the blue, really.

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Complete each of the following sentences with the correct answer (A, B, C or D).The traffic problem has improved _____, out of the blue, really.

gradually

factually

unexpectedly

respectably

Giải thích

Chọn C