17000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 3)

You look exhausted. You in the garden all day.

536/1620

You look exhausted. You _____________ in the garden all day.

must have worked

must be working

can’t have worked

must have been working

Giải thích

Chọn D