一、单项选择：从A，B，C，D四个选项中选出可以填入空白处的最佳答案。
1. I prefer coffee ________ milk. But they prefer ________ juice ________ soup.
A. to; to drink; drinking B. to; drinking; to drinking
C. at; drinking; to drinking D. at; to drink; to drink
2. You must do _______ I tell you.
A. that B. as C. like D. which
3. I _______ back tomorrow unless it
A. will; rains B. will be; rains C. am; rains D. will be; is going to rain
