9. ___________, it is obvious that the whole thing was a waste of time and effort.
A. None of us wanted to go in the first place
B. Staff meetings are often boring and have no apparent point to them
C. Since the results were far more satisfactory than anyone had expected
D. Seeing that we couldn't solve anything in the end
Ai giải thích câu này cho tui với, biết đáp án rùi nhưng ko coá hiểu á
