—The light in the office is still on.
—Oh, I forgot _______.
A：turning it off
B：turn it off
C：to turn it off
D：having turned it off
我会选
清晨，同学们（ ）走进校园，开始了一天的学习。
下列食品运用发酵技术的是（ ）
①葡萄酒 ②地瓜干 ③甜面酱 ④老酸奶 ⑤火腿肠 ⑥豆腐．
