题干
When I entered the room, I found my father in the sofa and in a magazine.
A：seated; absorbed
B：sit; absorb
C：sitting; absorbing
D：sat; absorbed
答案(点此获取答案解析）
A
沿弦AC翻折交AB于点D，连接CD．如果∠BAC=20°，则∠BDC=（ ）