We _________there when our father died.
Đáp án D
Một hành động đang diễn ra ở 1 thời điểm trong quá khứ => thì quá khứ tiếp diễnWhich of the followings is NOT an evidence of monitoring studying?
Our flight was delayed, but the plane finally _______shortly after midnight.
According to the passage, to learn new information, low-achieving students do NOT______.
Which of the followings is the flow of water from the ground to the surface?