I'm writing nine postcards __________ my mother.[ ]
A. at
B. of
C. to
答案：C
Only under special circumstances _____ to take make-up tests. [ ]
A. are freshmen permitted
B. permitted are freshmen
C. freshmen are permitted
D. are permitted freshmen
“文艺复兴”运动的代表人物有（）。
A．但丁
B．莎士比亚
C．哥白尼
D．伽利略
