Our teacher is-------a red sweater,A、puting on B、wearing

B
1) put on：一般强调动作.如：
It is cold outside,so you'd better put on your coat.外边冷,你最好穿上大衣.
Hearing the news,he put on his stocking and shoes,and went out.听到这一消息,他穿上袜子、蹬上鞋,就出去了.
2) wear：表示一种状态.如：
He is wearing a hat.他戴着一顶帽子.
The professor was short and wore a pair of thick glasses.教授个头儿不高,戴着一副深度眼镜.