Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 21)

She could ______ in the garden when we came around, which would explain why

11/50

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

She could ______ in the garden when we came around, which would explain why she didn’t hear the bell.

work

be working

have worked

have been working

Giải thích

Đáp án D