Bộ 20 đề ôn thi Chuyên Anh năm 2023 (Đề 73)

(7)_____ a book has been 'caught', the person finding it is encouraged to record the event by logging on to the book-crossing website and entering the book's ID number written on the label.

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(7)_____ a book has been 'caught', the person finding it is encouraged to record the event by logging on to the book-crossing website and entering the book's ID number written on the label.

Soon

Since

Once

While

Giải thích

Chọn C