(Viên chức Mầm non) 5000+ câu trắc nghiệm Ngoại ngữ có đáp án - Unit 2
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I ____________ this book on astrophysics for hours and I‘m still only on page 6. (read)

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I ____________ this book on astrophysics for hours and I‘m still only on page 6. (read)

Giải thích

have been reading (have read is also possible)