Bộ 20 đề luyện thi Chuyên Anh năm 2023 có đáp án (Đề 96)

She must in the garage when we came that's why she didn't hear the bell. A. have been working    B. be working     C. have worked    D. work

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She must _______ in the garage when we came that's why she didn't hear the bell.

have been working

be working

have worked

work

Giải thích

Đáp án: A