单选题 Sally was a bit shy, but her teacher found her quite______ discussing a recent film with others.
【正确答案】 A
【答案解析】固定搭配 at home doing sth ，意为在某方面没有拘束，熟悉，精通，很在行。题干意为：萨莉有点腼腆，不过老师发现最近她在和其他人讨论电影时一点都不拘束。故选A。