Mother is busy ______in the kitchen.A.cook B.cooks C.cooked D.cooking
问题描述:
Mother is busy ______in the kitchen.
A.cook B.cooks C.cooked D.cooking
答
D
be busy doing
答
D正在做饭
答
doing
答
d be busy doing sth
答
D.be busy 接动词加ing 忙于做什么的意思