Mary tried to keep calm although she was very disappointed.
Giải thích
Although/ though + S + be + adj = Adj + as + S + be
=>Mary tried to keep calm although she was very disappointed.
= Disappointed as she was, Mary tried to keep calm.
Tạm dịch: Mặc dù thất vọng, Mary cố gắng giữ bình tĩnh.
Đáp án cần chọn là: B