Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 7)

The hotel manager  more helpful during our stay. A. mustn’t have been   B. will have been     C. had to be      D. couldn’t have been

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The hotel manager ________ more helpful during our stay.

mustn’t have been

will have been

had to be

couldn’t have been

Giải thích

Đáp án: D