设区域D由曲线围成，则
D
The more we looked at the picture, ________.
I'm sorry I forgot to write; I had so much else ________ my mind.
中国共产党对资本主义工商业进行社会主义改造的第三步是______。
中古西班牙骑士文学的代表作品是 ()
He fell asleep immediately last night; he must ________ (be) very tired.
围成，则