They are tired now because they …………...in the field since early morning.
Đáp án A
Giải thích:
Dấu hiệu nhấn mạnh kết quả đang diễn ra trước mắt: They are tired now (bây giờ họ đang mệt)
Dấu hiệu chia động từ thì hoàn thành: since + mốc thời gian (since early morning)
=> Kết hợp 2 dấu hiệu: cần điền động từ chia thì hiện tại hoàn thành tiếp diễn vào chỗ trống.
Công thức: S + have/has + been + Ving.
Tạm dịch: Bây giờ họ đang mệt vì họ làm ở ngoài đồng suốt từ sáng sớm.
Chọn A.
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