Bộ 20 đề ôn thi Chuyên Anh năm 2023 (Đề 68)
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I’m sure he must ____ (3. be) at home last night because the door was open when I ____ (4. come).

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I’m sure he must ____ (3. be) at home last night because the door was open when I ____ (4. come).

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Giải thích

have been - came