Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có lời giải chi tiết (Đề 7)

Book-crossers 'release' books (60) _____ by passing them on to friends, or else by leaving them in public places for others to pick up, or 'catch', and then read,

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Book-crossers 'release' books (60)_____ by passing them on to friends, or else by leaving them in public places for others to pick up, or 'catch', and then read,

either

but

or

neither

Giải thích

Chọn A